AARP and a dozen other sites will tell you this is a big scam to install virus and Trojans on your computer to steal your personal information.. Just about everyone has little problems with their computer by the way.
He called today, 1-19-2016 , and said that I had a major problem with my computer. He told me repeatedly that I needed to turn the computer on and open Windows! I do not own a Windows based computer.
He hung up and I blocked the number