I put pass the virus and now I can not remember as restableserla or remove the p

well my problem is that I put to avast free pass and I can not remember how I can do to remove or reset ok I thank them a million thanks :‘( :’(

  1. Download avast! Free Antivirus: http://files.avast.com/iavs5x/avast_free_antivirus_setup.exe
  2. Follow instructions: http://www.avast.com/uninstall-utility
  3. Reinstall avast! with the downloaded installer from point 1.
  4. Reboot.