Calls from this number are a scam to trick you into believing your computer is infected and/or will permanently fail soon and that you should pay them to repair it. Don't believe them. They call from many different numbers, this being one of them. I received a call today from them saying they are from 'Windows' and my computer had sent them 'reports'. Since I repair computers for a living, I knew it was NOT a legitimate call. See more info here:
http://www.consumer.ftc.gov/blog/ftc-combats-tech-support-scams