Cannot open Avast

I have Avast Home Pro and cannot get into it. I set a password and I have tried many versions of it and says have wrong password. I may have written it down wrong is there anyway to reset it?

  1. Download avast! Pro Antivirus: http://files.avast.com/iavs9x/avast_pro_antivirus_setup.exe
  2. Follow instructions: http://www.avast.com/uninstall-utility (Run this tool for all prior installed avast! versions…!!)
  3. Reinstall avast! with the downloaded installer from point 1.
  4. Reboot.

Unless your computer is in a public place or, used by more than one user,
why are you setting up a password ???