- What OS are you using? is it up to date?
- What avast! version and VPS file (virus database) number, e.g. 0436-4 (see about avast!)

Clear your temporary Internet files and any other temp files.

If you have XP, open the avast program and ‘schedule a boot-time scan’ from the menu.

Check out Advice & Tools for virus/trojan/malware Removal & Prevention