How do I find out if spyware has been put on my mac?

I just had a popup appear telling me spyware had been installed on my mac and to download their anti spyware software. I ignored it but would like to check but I don’t know how. What can I do? How do I check? Thanks

Hi, r u running Windows on your mac? Then u should download spybot, if u r running OS X right now at the time u got the pop up then don’t worry your machine is safe.

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