New scam going around. Someone calls you saying they are from Microsoft or some other well known computer/software company. They tell you your computer is badly infected and needs to be cleaned and then ask you if you want them to clean it for you. This is a scam and you should hang up immediately!
There is no way anyone can see what’s on your computer remotely unless you run a special program first and then give them permission to access it. These people will try to sell you some useless software and a support contract and probably try to steal info from your system.