Avast Web Shield(Unsecured Website Problem)

I have a problem I can’t access unsecured website like youtube,yahoo,etc but I can access secured website like google,microsoft,etc. When I tried to disabled Avast I been able to access unsecured website I enabled Avast and try to find the cause of it.It cause by the webshield when I tried to turn It worked but when I turn on webshield and find the cause of it inside the webshield I can’t find it. I know i can just turn off webshield permanently but I don’t want to turn off webshield. Is there a way to go to unsecured and secured website but not a malware site.

See if a repair solves the problem.
Control panel > software > avast > add/remove > choose repair

What is your windows version? Xp,7,8, 8.1???

The windows 8 or above must have the latest updates, windows 7 must have SP1 installed!!!

Follow these steps http://www.avast.com/en-us/uninstall-utility

Then reinstall the Avast with the latest version form the website!!!