Hi,
I don’t see any malware here. Your PC is clean.

Do you have thouse logs?
C:\Documents and Settings\All Users\Application Data\AVAST Software\Avast\report[b]aswBoot.txt [/b]

Attach here avast logs so we can see what is detected.
I do not know what’s avast has detected ( with no logs ) but probably nothing dangerous.
My guess is that avast is just detects an system restore images and then avast mades ​​some random heuristic detection and you just so that.