There's a scam currently doing the rounds in this part of the world. I know it's been active in the UK and Ireland for about the last 6 months, to the extent that the consumer safety types actually put out a warning about it. Basically they call you up, ask for you by name, and claim it's about a problem with your computer. They might claim to be Microsoft, or affiliated, the exact details change.
They then get you to open the event viewer, and tell you all the little warnings in there mean your computer is in terrible trouble, but they can fix it. Then they want you to either install remote access software and/or pay a couple of hundred for their 'service'.
In the last 3 weeks I think they've called me 5 times. The first time, before I was aware it was a scam, I was just confused. When I told them there weren't any problems with my computer the line went dead. A bit of quick googling later, and I see the details. It's call centres in India or the Far East, using VOIP, and pretending to be located in the UK.
I was planning to have some fun with them the next time they called me, but this afternoon I was in the middle of a game online.
"Hello, is this mister <my name>?"
"My name is Jennifer, and this is regarding your computer."
"No, it isn't." <click>
I guess there must be at least a few groups trying this, as you'd think if they were told to go away once, they'd see there wouldn't be much point calling you again.
Anyways, if you get a phone call out of the blue, with someone telling you it's about the problems they've detected on your computer, it isn't :)