I, as many others was hit by these people. I have Kaspersky installed, which I thought would stop crap like this! The "support" tech is in India, with warehouse call center background noise so loud that it is hard to comprehend what he is saying. The part was clear, that you could go to Microsoft store and pay $500 to get it fixed or pay them $179 to fix it online. Once they take over your PC, they would have all the information they need to process FB, mail, and credit card charges to our account.
STAY AWAY from these bastards!