Oh I used to get these a lot, I just started asking them a LOT of reasonable polite questions: HOW do they know I have errors; What type of errors do they see? and PLEASE give me the error codes; How did "Microsoft" get my phone number if I never disclosed it?; So, my PC is having some errors, why don't I see them too?; For security reasons, can you give me your name and your official Microsoft number and I will call you back; .. My favorite is : Oh, sure I can start my computer, WHICH ONE should I start? Would a child's laptop be having the same errors then? Should I start ALL household's PC's and laptops.... They just stumble through saying some pretty ridiculous things... I must have "reasoned" them to death.. haven't got such calls in a while.. Such a horrible scam, they always sound very alarming and pushy, makes me think of more vulnerable people..