I just spent the last 30 minutes talking to a "Microsoft support" person. They called me out of the blue saying my computer is "totally infected with malicious software" and "showing" me how infected my PC was and telling me how my computer will implode if I don't do something about it. Then here's the kicker for just $299 they can renew my software warranty forever (on any PC and all future Windows platforms) and "help" me remove all these malicious files. So I said "$299; I would literally take a baseball bat to my computer before I pay $299 to Microsoft for this." Unfortunately they had another offer of $99 for 10 year coverage, which I declined then was promptly hung up on.
So was this actually MS support or just a phishing scam? I really hope it was not really Microsoft because if it really was them then they are doing some really shitty business.