Remove JS:Includer-BOF [Trj] Effectively and Permanently (Free Guides)

I can't access certain sites owing to Avast Anti-vir detecting a trojan infection - "JS:Includer-BOF".  The browser tabs display blank pages.  When I try to reach the sites via Google links, I'm redirected to what I assume are malicious sites, which are impossible to leave, save for closing the tab. All help is gratefully appreciated.  Thanks.
AdwCleaner 6.3.0 detects 3 registry entries, but I have left them in place. 

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