Yahoo Redirect Virus

I have ran tdskiller/RogueKiller/JRT/HitmanPro/Malwarebytes to absolutely NO avail. There is no extension in my Google Chrome extension list, in fact I don't have any extensions except for AdBlock which I have temporarily removed. All of the listed virus scanners say my computer has no threats detected yet I continue to be harrased by this redirection of all my browsers and search engines. Also my default settings are set to my likings... so it's not that either.

Please help me. I've been...

Yahoo Redirect Virus