"Unknown name" on CID @ 8:37am. Very earnest young Indian man (whose English was actually quite good, for once, nor did he cuss me out at the end of the call, which made a nice change) tried very VERY hard to convince me that he wasn't a scammer even though all the others who'd called me with the exact same spiel before might have been. Claimed to be from Microsoft, even, and that the "server" had automatically called me because of this problem with my computer.
But, you know, when they can't even tell you which operating system you use (which Microsoft should know), and they get your COUNTRY wrong (apparently Salt Lake City is in the UK, who knew!)... well, at that point, he knew the jig was well and truly up and politely ended the call after I wasted his time for about ten minutes.
Same thing just happened to me. Told him I didn't have a windows computer and then he started to change his story. I told him not to ever call me again and blocked the number. Hopefully they will get caught.