My MacBook Pro has said he has been infected by a virus, what should I do?

I was downloading music and a window popped up saying that my Mac has been infected by a virus. It never happened to me before. What should I do? How can I know that whether she was, and if so, how do I get rid of him? Thank you...

It's a scam. Close and ignore the window.

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Tags: Mac OS & System Software

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