DavidR
2
This looks like the anti-rootkit scan (8 minutes after boot), and the alert looks like the attached example image, is that what you saw ?
Is so the other avast scans won’t find anything as it isn’t a conventional scan, but more likely that it is a hidden process/driver which is considered suspicious. We will need the full path and file name of the alert though.
Check the anti-rootkit scan log - For winXP C:\Documents and Settings\All Users\Application Data\Alwil Software\Avast5\log\aswAr.log or the arpot.log. For Vista/win7 C:\ProgramData\Alwil Software\Avast5\log\aswAr.log or the arpot.log. This should give you which file name and full path, post that in your next post.