I turned my computer on and got this pop-up: NT Kernel System has changed since the last time you used it. What is this? Is this part of an update or is it a virus? Please help.

Could be either, but to be safe you should run a scan on your computer. Microsoft now has a FREE Microsoft Safety Scanner @ http://www.microsoft.com/security/scanner/en-us/default.aspxPlease remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

Hi, ntoskrnl.exe is a critical process in the boot-up cycle of the computer, that's why the warning pops up whenever you turn your computer on. The change can be due to a recent update. Base on my experience, when you are using the Symantec™ Endpoint Protection, it will give you a Network Threat Protection message. If you didn’t find any virus or spyware after scanning, you can click “yes” for this message. Regards, Leo Huang Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.