Ok, you’ve done the right thing :wink:

No, I want to know the local path you’re installing avast… something like:
C:\Program Files\Alwil Software\Avast4\

Please, follow:

  1. Remove NAV through Add/Remove programs from Control Panel. Boot.
  2. Use Symantec removal tool following the three steps defined in the SymNRT tool info or here.
  3. Boot.
  4. Install avast! Boot.
  5. See what you get.