Since I do not know the product of Avast that you use, please select from the one below. Since the Repair did not work, I suggest that you uninstall and do a clean install of Avast following the instructions below.
Uninstall Avast and do a
CLEAN install:
1. Save a copy of newest version of Avast (5.0.677) for the version you need and save it to your HDD:
Free –
http://files.avast.com/iavs5x/setup_av_free.exe - (multi-language version)
Pro –
http://www.avast.com/pro-antivirus#tab4AIS –
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.
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.
Free –
http://www.avast.com/registration-free-antivirus.php9. Update the Avast definitions.
Knowledge based article:
https://support.avast.com/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=504#idt_0003Let us know if this fixes your problem. If it does not, please give us more information about your machine, what other security software you have on your machine now and in the past (antivirus, firewall, other security programs). Thank you.