Lsass Error at Startup

[Guest Dreiber]

For the past few reboots, I have been receiving an error that says lsass

failed to start. I am running Windows Vista Ultimate and haven't had any

problems before. There is also no error number, and it doesn't say

lsass.exe, it only says lsass failed to start with an ok button.

 

I looked around the net and found that it could be a virus, however Nod32

hasn't picked it up, and I have only seen the virus in XP, not in Vista.

 

Anyone help would be greatly appreciated.