Hi DanielP
Do you have an Asus main board?
The below is for SAS
Conflict in security software can be the cause of various issues even if the security software has been uninstalled the debris left on the system needs to be removed with the removal tool for the specific security software.
singularlabs website on the link below and choose from the list.
http://singularlabs.com/uninstallers/security-software
Uninstall using windows add/remove programme. Check that the security software is not there.
Restart the computer.
Run the removal tool.
Restart the computer.
This process should be performed for each security software to be uninstalled, meaning one at a time.
If you have previously uninstalled then the removal tool needs to be run and the computer restarted.
You have said you have reinstalled Norton but did you use the below process?
Log into Norton management on the link below using your Norton account email address and password, click on my account, click on product details.
Click on the yellow download button and save the download.
Make a note of your current Norton product key from this page.
https://manage.norton.com/
If you use ACT! or WinFax, back up those databases before you proceed.
Download Norton removal tool link below. Running the Norton removal tool will remove other Norton products that are on the computer.
www.Norton.com/nrt
You’ll need to backup or export in both formats your identity safe and any other users identity safe if it is used, before doing the below.
Physically disconnect from the internet (unplug the internet cable or disable the wifi).
Uninstall Norton using the windows add/remove programme.
Restart the computer.
Recheck for Norton using the windows add/remove programme and uninstall if there.
Restart the computer.
Run the Norton removal tool.
Restart the computer.
Norton will automatically request an internet connection when it has failed to connect to the server, connect to the internet and click retry at this point norton is active connecting to the internet at an earlier time may have the computer unprotected and connected to the internet.
Install Norton and follow the prompts to activate it, run live updates as many times as it takes to get, no more live updates, restarting as requested.
Check your identity safe has data if not import the data.
If you have any questions please ask before starting.
This link, click here, is not directly related to the issue you are having but it is related to the Norton product and is about prefetch files.
ATB
Intesec