I would second what Peanut says if all else fails, too. I got a very horrible virus/series of malware a few years ago, and it made my computer freak out completely. Wiping it clean did the trick, and I didn't lose any important information (since it was backed up and I could easily put it back on my computer). So if worse comes to worst, definitely give that a shot. It's not the most appealing way to deal with it, but it's a lot cheaper than buying a whole new computer.
Oh and if this happens (or even if it doesn't), I'd recommend getting some strong security systems to avoid it happening again. I use Malewarebytes' too, and I also have a security system called Microsoft Security Essentials to ward off viruses. With both systems on my computer, I've found myself saved from malicious software countless times. I'd recommend getting both, since (from what I've seen) Malwarebytes' specializes in malware and Security Essentials specializes in viruses.
I also use Firefox with Adblock and NoScript applications, to make sure I don't get any malicious scripts over the Internet. Between my Firefox/Adlbock/NoScript, Malwarebytes', and Microsoft Security Essentials system, my computer's almost invincible now.