I got the same call that I have a virus on my windows PC I am not using windows I use Free BSD Unix.
I told him he was a full of crap and stop trying to rip off people
I also have Linux these guys are going up and down phone numbers with an autodialer
They are creating bot farms I am sure also using your saved information from websites etc. best thing to do is hang up definitely not real.
I've been getting three or four calls a day from this number and no one has ever been on the other line. They just keep calling every twenty minutes or so for a couple hours before they stop.