I have the same problem with the same registry key, you're lucky if you can run malwarebytes, root repeal, or any antivirus for that matter without them crashing during scanning, because I sure can't. And I have tried every renaming trick to get combofix to install properly and every time I get a status bar that freezes, no matter what mode or what I name it. There's gotta be some way to delete this registry key. I found that this was my problem from using IObit Security 360, and it's all I have to go on right now. I'm hoping once I delete that registry key it will stop redirecting every browser but google chrome to ad-ware sites and stop blocking them from downloading antivirus, but I doubt it. When I run an anti-virus program from a download off Google Chrome it will install, but when ran the software will crash and the permissions become locked. Seems like there must be some sort of service that's running that I'm not aware of, but even in safe mode nothing seems out of the ordinary. I've gotten root repeal to scan for everything except files, but it doesn't come up with much.... ... Oh and just recently my thumbnails stopped showing up, which means my desktop background just disappeared, but that could be unrelated.