My parents have been getting calls from an indian call centre telling them they have a virus on their PC, and as they are affiliates of microsoft they will talk as through clearing the virus.
Sounded unlikely, so i told my parents to ignore it, i had an interesting conversation with the "call centre" when they happened to ring when i was there earlier and i asked what microsoft OS we were running and what our address was and they said "i dont understand what you are saying, speak to my supervisor" - then i hang up.
There have been several Posts on here about these type of scams. Microsoft or anyone else associated with Microsoft would never ring you. They are nearly always from an Indian Call Centre or a person with an Indian Accent.
When I get a cold call, I say "Oh hang on a minute there is someone at the door". I put the phone near the radio or TV and leave it there for 10 mins. or so. By that time they usually have got fed up and cleared the call.