xp pro
celeron 1000 thinges
no problems before install avast 4
any help appreciated
I have read to uninstall other virus program in safe mode, why?
you can’t have 2 or more anti-virus programs running together… 
Except for quite few combinations, shgoh is fully correct?
Which av did you install before?
Why do you not remove if before installing avast? Did you only disable it?