Infection Blocked Notification Each time I turn My Pc On - Please Help

Hi Guys… I need a bit of help here… Im not a Techy guy so please bear with me…

Pretty Much each time I log my Pc on I get a Threat Blocked Notification from Avast… The URL it comes from varies but sometimes is ones which sound familiar (i.e. I have seen the name before). Here Is an example of One : http://gyazo.com/831617861b01a246572028a7441721f6

I have done scans Using Avast, Malwarebytes, CC cleaner, & MSE but they never find anything…

The threat detection is a recurring notification & is therefore making me wary…

Any help would be great

Thanks

Yak

Malware removal help is done in viruses and worms forum section https://forum.avast.com/index.php?board=4.0

And please make the link not clickable.
We do not want people to visit malicious websites.