Hi, welcome to the forums.

  • What OS are you using? is it up to date?
  • avast! version and VPS file (virus database) number, e.g. 0436-4 (see about avast!)
  • What was the virus name, what was the filename, where was it found
    example (C:\windows\system32\infected-filename.xxx)?

General Advice & Tools for virus/trojan/malware removal