« Reply #2 on: November 17, 2013, 12:44:55 AM »
Try a repair...Control Panel>Uninstall a Program>double click "avast">click "repair">reboot
You failed to mention which version of avast (v7.0 v8.0 or v2014)?
Also any other security software?
For more see
http://www.avast.com/faq.php?article=AVKB9#artTitle
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Dell Inspiron, Win10x64--HP Envy Win10x64--Both systems Avast Free v17.9.2322, Comodo Firewall v8.2 w/D+, MalwareBytes v3.0, OpenDNS, Super Anti-Spyware, Spyware Blaster, MCShield, Unchecky, Vivaldi Browser and, various browser security tools.
"Look before you leap!" Use online scanners before you click on any link.