Our local BBB sent out a warning on a computer scam currently going on where someone calls claiming to be from Microsoft (or other), saying they have detected something wrong with your computer. They go on to try to get you to download some software to fix it. You know the rest of the story.
I've had two of those calls this week. Heavy foreign accent, most likely Indian or some other country in that area. They probably don't enjoy my response too much when I tell them what to do to themselves.