Open Task Scheduler, navigate to Task Scheduler Library | Microsoft | Windows | .Net Framework and disable all tasks starting with .Net Framework NGEN
Visual studio configures these tasks and they're currently conflicting with Norton Security.
Nothing to do with Norton background tasks, it's Norton Auto-protect fighting with the Native Image Generator, which is supposed to improve the performance of .Net applications. It's this task that kicks off when the computer is idle, not Norton. I have a lot of development folders excluded from Sonar but disabling Sonar didn't help this situation.
For the Norton developers: I installed Windows 10 and Norton Security in a virtual machine and it behaved normally so I knew it was an issue with my two computers. Immediately after installing Visual Studio 2013, the virtual machine behaves in a similar fashion so this is easy to reproduce. There is nothing else on this machine, just Windows 10 express settings with all updates, Norton Security V22.14.0.54 and Visual Studio 2013 with no optional components. Leave it for four minutes or run the tasks manually and away we go.
Same problem here. Every time computer goes into idle, fan goes on due to Norton spiking 25-30%. Been using Norton for years and this never happened. Started about a week ago. Tried contacting Norton 3 separate times and got no help. Last time was yesterday afternoon and they took my number and said they would get back to me. A day later and have not heard a word. Quite frustrating.
Apologies for hijacking your thread Vlad1ki3 but the more noise the better I reckon.
I'm back on the 30% version of this and my notebook is doing exactly the same thing but at 45%. Both are running V22.14.0.54. I'm rapidly running out of patience and struggling to find a solution.
I used the NRnR tool to refresh my installation as per Imacri's suggestion. Some of my settings were retained but many were reset. My previous reinstall was stock standard keeping all settings. I have Norton Security Premium for five devices and this installed version 22.12.0.104. I ran all background tasks including LiveUpdate but the version hasn't changed. Have they pulled V22.12.1.15?
After four minutes idol, Norton decided to run the 15% version described by Thel85. It ran for an hour before winding down without intervention. My monitors were off but I heard the fans wind down so I checked and sure enough it had completed and was no longer using 15% CPU.
Edit: I ran LiveUpdate from the main interface rather than from the background tasks and it installed V22.14.0.54. After rebooting and waiting for seven minutes of idol, it started the 15% CPU version again. Not sure if this is progress or not. After four minutes I thought briefly that everything was fixed but it's still broken.
it will keep happening every time I go idle for 4-5 minutes until I let it finish whatever it's doing, which takes about 10 minutes on my PC.
This is slightly different to the 30% issue which never completes. I've seen the 15% behaviour you describe as well with this version but it only ramps up for a relatively short period. I think it depends on which crypto-currency they're mining on the day.
Today's behaviour for me is the 30% version after exactly four minutes of idle time. It takes seven seconds to reach the 30% peak.
I've been having the same problem as others for about a week now and mickhardy's task manager picture is similar to what happens in mine. Whenever norton spikes up my CPU (usually to around 13%, I have a gaming CPU so the spike doesn't use as much of my CPU) I notice that .NET optimizer process and the MS Common Language processes come up. They both disappear the moment I move my mouse and norton stops spiking after a few more seconds.
As far as I can tell this is Norton causing this issue as I've turned it off completely a few times (after interrupting whatever this is) and let my PC go idle and nothing happens. Those 2 Windows processes that I listed above don't appear when Norton's off either. I went into task scheduler (in windows not just Norton) and made sure that .NET optimizer was set to off for idle times, and it was. All of the settings recommended in here for Norton itself I also already had turned off long before this started happening. It happens at least once per day and sometimes twice (in the morning and later at night) and it will keep happening every time I go idle for 4-5 minutes until I let it finish whatever it's doing, which takes about 10 minutes on my PC.
....I would be much more happier if I saw a respond with something like "we didn't know for sure what causes that usage, can you give us some extra details", or "can you contact our costumer service specialist via e-mail or ...(something useful)". I am sure that there are plenty of users with that type of issue that didn't want to write about it or didn't notice that issue yet.
If you prefer to contact Norton Customer Support directly the links are posted on the right side of every page in this forum as shown in the image below. Live Chat is available at https://www.norton.com/chat.
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32-bit Vista Home Premium SP2 * Firefox ESR v52.7.3 * NS Premium v22.12.1.15 * MB v3.3.1
Installed two Norton updates this morning. Didn't solve my problem. I guess there is no point to add prt sc with Norton 30% usage and all the rest of programs lower that 1% at the time of idle. My vent is running crazy and, as ithacacian said, it is much cheaper for me to change my subscription to Norton than repair possible damage. I understand that most of the Airlines companies respond to the clients in Twitter at the exact same day because of the urgency. The problem, that we collectively sharing, is not that urgent, but still if someone's addressing a letter - he's hoping for an answer, doesn't matter good or bad for him. An answer. We didn't write on reddit or somewhere else. We decided that it will be much more faster to Norton staff members to respond on their own web-site.
If you will call the police and will say that you have a fever - they will gently ask you to call an ambulance and wish you good fortune. That is respond. It will not cure or smth, but at least you will know that there is no point in waiting for someone from police to come and help. Point is: I wrote that I have a problem. I am waiting for an answer. I would be much more happier if I saw a respond with something like "we didn't know for sure what causes that usage, can you give us some extra details", or "can you contact our costumer service specialist via e-mail or ...(something useful)". I am sure that there are plenty of users with that type of issue that didn't want to write about it or didn't notice that issue yet.
Sorry if my message is offensive.
IDK if that will help someone to resolve my issue, but I have
Intel(R) Core(TM) i7-6700HQ CPU @ 2.60GHz
4 GB NVIDIA GeForce GTX 950M
x64 Windows 10
latest updates installed via HP Support Assistant and Intel Driver and Support Assistant.
Would it be possible for one of the Gurus monitoring this thread to haveThe this problem escalated to a Norton employee?
OK. Done.
The NCW running may just be the feature gathering information in case the user wishes to join the program at a later date. It just does not get transmitted to Norton. Actually in this case, if it were enabled, it might be sending back telemetry on how the users system is behaving with this elevated CPU usage.
Would it be possible for one of the Gurus monitoring this thread to have this problem escalated to a Norton employee? At this point it might be worthwhile to have someone from Norton providing input and/or collecting diagnostic logs for the support techs to see if they can find a root cause.
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32-bit Vista Home Premium SP2 * Firefox ESR v52.7.3 * NS Premium v22.12.1.15 * MB v3.3.1
mickhardy:
...Edit 3: I've just noticed NCW ran this morning despite being disabled. This would have been about the time I went for a run. Not sure if this sheds any light on anything for anyone....
Hi mickhardy:
I don't know why but NCW always reports that it runs each day for a 1 sec duration in the Norton Tasks window on my system and I always have this task disabled, so I wouldn't worry about that. Here's an old screenshot from Sept 2017 when I was using NS Premium v22.10.1:
Have you tried a refresh of your installation yet with the Norton Remove and Reinstall (NRnR) tool as instructed at https://www.norton.com/nrnr? If that didn't help post back and let me know what NS product you use (Basic, Standard, Deluxe or Premium) and I can provide instructions for a clean re-install that will perform a deeper wipe of NS, which is sometimes required for stubborn problems.
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32-bit Vista Home Premium SP2 * Firefox ESR v52.7.3 * NS Premium v22.12.1.15 * MB v3.3.1
I am facing the same issues as many other users with the most recent Norton Security build. Bluntly to say, it was frying my CPU running at 60% at idle times, and my CPU temperature reading was as high as 96 deg C. Some extra details:
(1) My OS is Windows 8.1 Pro and the fast startup option is disabled for years.
(2) I used Norton Remove and Reinstall module with the Norton Security and the problem remained.
(3) Just like Vlad1ki3, all the automatic /scheduled settings are disabled: (a) Disc Optimizer, (b) full system scan, (c) performance monitoring, (d) norton community watch, (e) idle time optimizer.
(4) I even had Norton Security in the Silent Mode for several hours, and when I returned the CPU was running hot. This was a deliberate test where no browsers was opened. See Task Manager image in attached PDF.
(5) And yes I checked background tasks and no prior actions were taken hours by Norton Security. See attached second image. Yet Norton Security was burning through the CPU with the fan blowing at full speed. Note all background tasks required less than 5 min to run, but the CPU was burning hot for tens of minutes if not hours!
(6) I have been using Symantec Endpoint Protection for five years with my employer and got my own Norton Security three years ago. Not once I recall to have encounter this problem.
At this point, I am prepared to forsake my remaining two-and-half year subscription and jump ship to save the hardware …
I've woken up to an eerily quiet computer. It appears to have finally finished whatever it was doing and is back to normal. Live update and quick scan are the only two background tasks that ran last night. I didn't change anything. I was asleep.
Thanks for all your help and suggestions in this and other threads.
Edit: Well, that was short lived. Back up to 30% after my morning run.
Edit 2: I've added my specs to my signature. Fast startup was disabled prior to the reinstall about four days ago. I've been through the post Imacri linked and tried everything I could find on these forums prior to posting. I'm not one to post on forums before battling it alone well beyond the point of despair.
Edit 3: I've just noticed NCW ran this morning despite being disabled. This would have been about the time I went for a run. Not sure if this sheds any light on anything for anyone.
Edit 4: It looks like I need a new post to show my signature so I'll add it here to avoid double posting.
rindert:
I had the exact same issue as mickhardy. Popped up recently. Reinstalling with the remove-reinstall tool didn't help. What did though, was returning to one of my Windows backups and installing NS on that.
Hi rindert:
Thanks for the feedback about the NRnR tool.
Could you let us know your Windows OS [include the version/build if Win 10 (e.g. Version 1709 build 16299.334)] and your Norton product name and version number (go to Help | General Information | About).
If you have a Win 8.x or Win 10 OS is the Fast Startup power option described in peterweb's thread Windows 8/8.1 or 10 and Fast Start Feature normally enabled (the default) or disabled on your system?
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32-bit Vista Home Premium SP2 * Firefox ESR v52.7.3 * NS Premium v22.12.1.15 * MB v3.3.1
I had the exact same issue as mickhardy. Popped up recently. Reinstalling with the remove-reinstall tool didn’t help. What did though, was returning to one of my Windows backups and installing NS on that.
mickhardy:
...If I reboot and walk away with nothing running other than task manager, Norton ramps up in under five minutes with this 30% CPU usage. It runs like that all night every night for weeks now....
Hi mickhardy:
Users rn333617 and dsiebold have posted similar comments about unusual and excessive CPU activity by nortonsecurity.exe during system idles in the 28-Mar-2018 thread nortonsecurity.exe running at high cpu for long time.
It's possible there was a glitch during the recent product update to v22.12.1.15 that corrupted your installation (see my comments in rn333617's thread about the Norton Remove and Reinstall tool) but there are a few other troubleshooting tips in that thread that might help you determine if there could be a more serious problem like a bug in v22.12.1.15 or a conflict with a recent Windows OS update.
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32-bit Vista Home Premium SP2 * Firefox ESR v52.7.3 * NS Premium v22.12.1.15 * MB v3.3.1
Thanks for the suggestions Imacri but they were all disabled as per your screenshot. I did have that screenshot same as yours but missed posting it. I ran the disk defrag manually and it completed in a few hours. I ran most of the background tasks manually prior to the screenshots and then waited a few days before posting but it didn't change anything.
Norton Community Watch only takes a minute so I left it enabled. I've disabled that just now and see no change.
If I reboot and walk away with nothing running other than task manager, Norton ramps up in under five minutes with this 30% CPU usage. It runs like that all night every night for weeks now. I've been using Norton for years peterweb. This is not normal behaviour.
Apart from updates for existing software, the only recent applications installed in that time frame are CyberPower PowerPanel for a new UPS and DisplayFusion for a new monitor.
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Have you tried a refresh of your installation yet with the Norton Remove and Reinstall (NRnR) tool as instructed at 
