73 Errors detected by start up scan in norton definitions files, why? Example: File C:\Program Files\Norton\Suite\defs\24100408\norton.local_vc142.crt\api-ms-win-core-fibers-l1-1-0.dll Error 0xC000003E {Data Error}

Norton 360 for Windows
1

Note: Please do not post Personally Identifiable Information like email address, personal phone number, physical home address, product key etc.

Issue abstract: Startup scan found errors in Norton definition files

Detailed description: example: File C:\Program Files\Norton\Suite\defs\24100408\norton.local_vc142.crt\api-ms-win-core-fibers-l1-1-0.dll Error 0xC000003E {Data Error}

Product & version number: Norton 360 v24

OS details: windows 11 home

What is the error message you are seeing?

If you have any supporting screenshots, please add them:
10/04/2024 21:46
Scan of C:

Scan of *STARTUP

File C:\Program Files\Norton\Suite\1033\norton.local_vc142.crt\api-ms-win-core-file-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\1033\norton.local_vc142.crt\api-ms-win-core-heap-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\1033\norton.local_vc142.crt\api-ms-win-core-interlocked-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\1033\norton.local_vc142.crt\api-ms-win-core-file-l2-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\1033\norton.local_vc142.crt\api-ms-win-core-namedpipe-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\1033\norton.local_vc142.crt\api-ms-win-core-profile-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\1033\norton.local_vc142.crt\api-ms-win-core-rtlsupport-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\1033\norton.local_vc142.crt\api-ms-win-core-string-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\1033\norton.local_vc142.crt\api-ms-win-core-synch-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\1033\norton.local_vc142.crt\api-ms-win-core-synch-l1-2-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\1033\norton.local_vc142.crt\api-ms-win-core-sysinfo-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\1033\norton.local_vc142.crt\api-ms-win-core-timezone-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\1033\norton.local_vc142.crt\api-ms-win-core-util-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\1033\norton.local_vc142.crt\api-ms-win-crt-conio-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\1033\norton.local_vc142.crt\api-ms-win-crt-convert-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\1033\norton.local_vc142.crt\api-ms-win-crt-environment-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\1033\norton.local_vc142.crt\api-ms-win-crt-filesystem-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\1033\norton.local_vc142.crt\api-ms-win-crt-heap-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\1033\norton.local_vc142.crt\api-ms-win-core-console-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\1033\norton.local_vc142.crt\api-ms-win-core-console-l1-2-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\1033\norton.local_vc142.crt\api-ms-win-core-datetime-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\1033\norton.local_vc142.crt\api-ms-win-core-debug-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\1033\norton.local_vc142.crt\api-ms-win-core-fibers-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\1033\norton.local_vc142.crt\api-ms-win-crt-locale-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\1033\norton.local_vc142.crt\api-ms-win-crt-math-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\1033\norton.local_vc142.crt\api-ms-win-crt-multibyte-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\1033\norton.local_vc142.crt\api-ms-win-crt-private-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\1033\norton.local_vc142.crt\api-ms-win-crt-process-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\1033\norton.local_vc142.crt\api-ms-win-crt-runtime-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\1033\norton.local_vc142.crt\api-ms-win-crt-stdio-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\1033\norton.local_vc142.crt\api-ms-win-crt-string-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\1033\norton.local_vc142.crt\api-ms-win-crt-time-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\1033\norton.local_vc142.crt\api-ms-win-crt-utility-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\1033\norton.local_vc142.crt\msvcp140_atomic_wait.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\1033\norton.local_vc142.crt\msvcp140_codecvt_ids.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\1033\norton.local_vc142.crt\api-ms-win-core-file-l1-2-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\1033\norton.local_vc142.crt\vcruntime140_threads.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\1033\norton.local_vc142.crt\api-ms-win-core-memory-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\1033\norton.local_vc142.crt\api-ms-win-core-handle-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\24100408\norton.local_vc142.crt\api-ms-win-core-fibers-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\24100408\norton.local_vc142.crt\api-ms-win-core-file-l1-2-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\24100408\norton.local_vc142.crt\api-ms-win-core-file-l2-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\24100408\norton.local_vc142.crt\api-ms-win-core-handle-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\24100408\norton.local_vc142.crt\api-ms-win-core-heap-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\24100408\norton.local_vc142.crt\api-ms-win-core-memory-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\24100408\norton.local_vc142.crt\api-ms-win-core-profile-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\24100408\norton.local_vc142.crt\api-ms-win-core-string-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\24100408\norton.local_vc142.crt\api-ms-win-core-synch-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\24100408\norton.local_vc142.crt\api-ms-win-core-synch-l1-2-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\24100408\norton.local_vc142.crt\api-ms-win-core-sysinfo-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\24100408\norton.local_vc142.crt\api-ms-win-core-timezone-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\24100408\norton.local_vc142.crt\api-ms-win-core-util-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\24100408\norton.local_vc142.crt\api-ms-win-crt-conio-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\24100408\norton.local_vc142.crt\api-ms-win-crt-convert-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\24100408\norton.local_vc142.crt\api-ms-win-core-console-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\24100408\norton.local_vc142.crt\api-ms-win-core-console-l1-2-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\24100408\norton.local_vc142.crt\api-ms-win-core-datetime-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\24100408\norton.local_vc142.crt\api-ms-win-core-debug-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\24100408\norton.local_vc142.crt\api-ms-win-crt-heap-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\24100408\norton.local_vc142.crt\api-ms-win-crt-locale-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\24100408\norton.local_vc142.crt\api-ms-win-crt-math-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\24100408\norton.local_vc142.crt\api-ms-win-crt-multibyte-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\24100408\norton.local_vc142.crt\api-ms-win-crt-private-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\24100408\norton.local_vc142.crt\api-ms-win-crt-process-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\24100408\norton.local_vc142.crt\api-ms-win-crt-runtime-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\24100408\norton.local_vc142.crt\api-ms-win-crt-stdio-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\24100408\norton.local_vc142.crt\api-ms-win-crt-string-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\24100408\norton.local_vc142.crt\api-ms-win-crt-time-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\24100408\norton.local_vc142.crt\api-ms-win-crt-utility-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\24100408\norton.local_vc142.crt\msvcp140_atomic_wait.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\24100408\norton.local_vc142.crt\msvcp140_codecvt_ids.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\24100408\norton.local_vc142.crt\vcruntime140_threads.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\24100408\norton.local_vc142.crt\api-ms-win-core-file-l1-1-0.dll Error 0xC000003E {Data Error}
Number of searched folders: 72431
Number of tested files: 585500
Number of infected files: 0

2

I have the same issue, but i have no idea at 100% whats causing it.

Does anyone else have the same issue?
I don’t know how i can add any screen shot from the scan here other than maybe using my phone to take a picture of it…

As for what’s causing it, at first i thought i might be the updates from Norton 360 ver.24.x.x itself but seeing how old your post is and that this issue started for me only very recently (about a week ago) i can think of only maybe 1 thing that changed deeply on my PC that MAYBE could be causing it. It woukd be ever since i got a update of my BIOS to it’s newest version done.

From i quick glance i could see something about memory and SPD write protection that could be enabled in it now and comes turned ON by default after the update of the BIOS… i would need to check it at home on i get back (i wrote while on break at work) :sweat_smile:. But as i said im not sure if it’s that…

3

Same thing here. Latest 360 installed in win 11 pro with all updates.
I have 360 installed in Win7, Win 10 and Win 11. Only having this in Win 11.

Managed to remove all the files in the pointed folder and issues disapeared until i restarted. The files came back again with the issues included.

Tried uninstalling and reistalling, the auto repair option and the live updates.
Nothing works.

Seems this is pretty old. Did you get any response or is worthless to post here?

--------------------------------------->

8/12/2025 20:42
Scan of C:

Scan of *STARTUP

File C:\Program Files\Norton\Suite\defs\25081202\norton.local.crt\api-ms-win-core-file-l1-2-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\25081202\norton.local.crt\api-ms-win-core-fibers-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\25081202\norton.local.crt\api-ms-win-core-file-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\25081202\norton.local.crt\api-ms-win-core-fibers-l1-1-1.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\25081202\norton.local.crt\api-ms-win-core-file-l2-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\25081202\norton.local.crt\api-ms-win-core-handle-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\25081202\norton.local.crt\api-ms-win-core-interlocked-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\25081202\norton.local.crt\api-ms-win-core-heap-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\25081202\norton.local.crt\api-ms-win-core-libraryloader-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\25081202\norton.local.crt\api-ms-win-core-localization-l1-2-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\25081202\norton.local.crt\api-ms-win-core-memory-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\25081202\norton.local.crt\api-ms-win-core-rtlsupport-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\25081202\norton.local.crt\api-ms-win-core-sysinfo-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\25081202\norton.local.crt\api-ms-win-core-processthreads-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\25081202\norton.local.crt\api-ms-win-core-string-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\25081202\norton.local.crt\api-ms-win-core-profile-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\25081202\norton.local.crt\api-ms-win-core-processthreads-l1-1-1.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\25081202\norton.local.crt\api-ms-win-core-synch-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\25081202\norton.local.crt\api-ms-win-core-sysinfo-l1-2-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\25081202\norton.local.crt\api-ms-win-core-synch-l1-2-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\25081202\norton.local.crt\api-ms-win-core-timezone-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\25081202\norton.local.crt\api-ms-win-core-util-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\25081202\norton.local.crt\api-ms-win-core-console-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\25081202\norton.local.crt\api-ms-win-crt-utility-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\25081202\norton.local.crt\api-ms-win-core-datetime-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\25081202\norton.local.crt\api-ms-win-core-debug-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\25081202\norton.local.crt\api-ms-win-core-errorhandling-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\25081202\norton.local.crt\api-ms-win-core-namedpipe-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\25081202\norton.local.crt\api-ms-win-crt-conio-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\25081202\norton.local.crt\api-ms-win-core-console-l1-2-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\25081202\norton.local.crt\api-ms-win-crt-convert-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\25081202\norton.local.crt\api-ms-win-crt-environment-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\25081202\norton.local.crt\api-ms-win-crt-filesystem-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\25081202\norton.local.crt\api-ms-win-crt-heap-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\25081202\norton.local.crt\api-ms-win-crt-locale-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\25081202\norton.local.crt\api-ms-win-crt-math-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\25081202\norton.local.crt\api-ms-win-crt-multibyte-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\25081202\norton.local.crt\api-ms-win-crt-private-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\25081202\norton.local.crt\api-ms-win-crt-process-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\25081202\norton.local.crt\api-ms-win-crt-runtime-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\25081202\norton.local.crt\api-ms-win-crt-stdio-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\25081202\norton.local.crt\api-ms-win-crt-string-l1-1-0.dll Error 0xC000003E {Data Error}
File C:\Program Files\Norton\Suite\defs\25081202\norton.local.crt\api-ms-win-crt-time-l1-1-0.dll Error 0xC000003E {Data Error}
Number of searched folders: 59605
Number of tested files: 456892
Number of infected files: 0

08/12/2025 21:35
Scan of C:

Scan of *STARTUP

Number of searched folders: 53641
Number of tested files: 441315
Number of infected files: 0

4

@v45gsh4svhb @elliotwebdesign @Ran The error Error 0xC000003E, no matter the version of Windows is one that has several reasons. The first, is improper permissions to run the program at hand. Please review the linked articles below.

Questions for me are:
-Have any of you had any contact with Norton support about this issue?
-Are your devices fully updated and on the latest version updates for your OS?
-Are ALL of you logged into your computers with an account that has administrative permissions?
-Have you ran SFC and DISM Scans?
-Are any of you on the latest version 25.7 of Norton

SA

5

This is a brand new computer with a bran new m.2 with a brand new installation of windows 11 with a brand new installation of 360…

Error comes when running the startup scan.
360 finds itself issues…

Does not sound right. And having all.new and paying for 360 subscription I don’t see why should I start fighting with permissions.

Already feeling was aistake to post here.

6

We have no way of knowing that your computer is brand new, that wasn’t reflected in your opening post. The misconception that a new device cannot have issues is just that, a misconception. Dirty factory images are in fact common but not extremely common. I asked the below questions earlier to get a sense of what is what to better assist you.

We can offer contact with Norton support as another avenue for you to follow. Please use the link below:

Regards,
SA