I was sitting at the computer this morning when the phone rang. It was the Windows Microsoft Technical Department? He told me that my computer had been acting up and he was calling to fix it for me. He said he had the computer's personal identification number, specific to each and every computer. Nobody but registered technicians and me had the number. He had me open a DOS cmd window and type "assoc", which brought up what looked like file associations. He pointed me to the longest line and had me follow it as he read it off, matching it digit for digit. My Bullshit Meter was pegged by this time, but it was a pretty convincing scam. I asked him why both he, the supervisor, and his young techie were both sporting eastern Indian accents and calling from Texas instead of Silicon Valley or Redmond.
I said "No, I'm not comfortable continuing this dialog." so he proceeds to tell me that they cannot be held responsible for anything that happens, that the hacker is hacking away at my computer as we speak. By this time, I had "zfsendtotarget" googled up and it was warning about others of his type doing this scam, and that the clsid of that target is the same on every computer, that these guys want to sell you a very expensive malware suite and/or put a healthy virus on your computer.
If I hadn't just had a recent run-in with a virus attempt, I would have quickly told him to bugger off. But he had me (cautiously) going there for a few minutes.
Be warned, these assholes are out there and seem to be multiplying. It's too bad one can't send a 750KV spike direct to their computer or phone during one of these attempts, isn't it?