Well, as you still have “Alwil” in your path, you should try a clean re-install.

  1. Follow instructions here: http://www.avast.com/uninstall-utility
  2. Download & install the appropriate version:
    avast! 6.x Free Antivirus: http://files.avast.com/iavs5x/setup_av_free.exe
    avast! 6.x Pro Antivirus: http://files.avast.com/iavs5x/setup_av_pro.exe
    avast! 6.x Internet Security: http://files.avast.com/iavs5x/setup_ais.exe
  3. Reboot.