Is this just a scam or is there really something wrong with my computer?

Attention

Your PC is in danger!
Your system requires AV check.
AV Center will now perform a quick and free scan of your PC.

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This is the message I get on my computer when I’m browsing the internet. I think it’s just a scam to get you to buy virus removal software.

Has anyone else gotten this message and is there anything I can do to get rid of it besides running virus check?