I then suggest an Avast uninstall and clean install:

  1. Save a copy of Avast for the product you need and save it to your HDD (if not already done): http://www.avast.com/download-software
  2. Download the Avast Uninstall Utility http://files.avast.com/files/eng/aswclear6.exe and save it to your HDD.
  3. Disconnect from the Internet at this time.
  4. Go to Control Panel and uninstall Avast through Add/Remove Programs if possible and reboot.
  5. If Step 4 fails, boot into Safe Mode (hit F8 repeatedly) and run the Avast Uninstall Tool. Uninstall ALL previous versions and products of Avast one at a time and reboot in between.
  6. Reboot.
  7. Install the newest version of Avast and reboot.
  8. Get Internet access and register your copy or add the license key for Free, Pro, or AIS.
  9. Update the Avast definitions and reset your settings.

Let us know if this fixes your problem. Thank you.