My dad received a call very similar to those described here. Caller ID said "Unknown". The caller with a heavy Indian accent, very hard to understand, told him that he worked for the Microsoft repair/tech division. He said that due to some Microsoft upgrades his system was infected, not a virus, but that it was damaging his computer and getting information. He wanted us to press the Windows key and something else. He was also going to transfer us to another department. When my dad called me over, and I spoke with this person briefly, I knew it had to be a scam.
When I asked for the phone #, he hesitated, and I could hear someone else giving him the digits listed here 801-512-0605. I told my dad to use logic and be on guard. Microsoft is not going to launch a worldwide campaign one customer at a time. The School of Common Sense folks.