system
8
As said, it’d be extremely beneficial to debugging to get in touch with someone who can provide technical description. Meanwhile, there’s Avast 2014 released, Avast 8 is outdated. You can try to upgrade and see if it helps. Or better yet, uninstall and do a clean install of the new version.
http://www.avast.com/uninstall-utility
http://files.avast.com/iavs9x/avast_free_antivirus_setup.exe
http://files.avast.com/iavs9x/avast_pro_antivirus_setup.exe
http://files.avast.com/iavs9x/avast_internet_security_setup.exe
http://files.avast.com/iavs9x/avast_premier_antivirus_setup.exe