As mentioned earlier, please try the
Avast Repair first:
- Go to Control Panel > Add/Remove programs > Avast Antivirus.
- Scroll down and choose Repair function in the pop-up window.
-
Reboot.
If this fails to fix your problem, then an uninstall and clean install is required:
1. Save a copy of newest version of Avast (5.0.677) for the version you need and save it to your HDD:
AIS –
http://files.avast.com/iavs5x/setup_ais.exe2. Download the Avast Uninstall Utility, aswClear5.exe
http://www.avast.com/uninstall-utility and save it to your HDD (it has uninstall tools for both 4.0 and 5.0).
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 of Avast you had on this machine at this time.6.
Reboot.
7. Install the newest version of Avast and
reboot.
8. Get Internet access and add the license key for AIS.
9. Update the Avast definitions.
Please let us know if this fixes your problem. Thank you.