Hi annette,

have you completely removed the virus from this post:
http://forum.avast.com/index.php?board=4;action=display;threadid=5166 ?

please reboot in SafeMode, empty all your TEMP-folders & IE-Cache= Temp.Internet-files, then

  • do a diskcleanup & defrag (still in SafeMode)
  • do a complete scan with avast