NOBODY ASSOCIATED IN ANY WAY WITH MICROSOFT WILL EVER CALL YOU ABOUT YOUR COMPUTER.
These are scammers trying to commit fraud by telling you they are calling from Windows Support or from the Technical Department of Windows about error messages on your computer. They are lying to you, typically by showing you a Windows error message log that shows common, internal Windows errors that Windows is designed to handle. If you really think something is wrong with your computer, hang up on them and give me a call.
DO NOT ALLOW THEM REMOTE ACCESS TO YOUR PC. DO NOT GIVE THEM CREDIT CARD INFORMATION. PROTECT YOURSELF & YOUR IDENTITY, HANG UP ON THEM.