I got a virus warning with a telephone number to call

A virus warning popped up on my computer and it had a number to call to get rid of the threat. I'm certain its a scam as I would never allow someone access to my machine. I'm thinking of renstalling everything. When I tried to get of the message it wouldn't go away and I had to restart. So far no sign of it. I did a Norton scan but I doubt if that will keep it away forever.



Suggestion?

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