How do I get rid of the system security? Computer experts only!!?

I just had my computer fixed a few weeks ago and now whenever I try to use it this box pops up that says system security and it'll scan my computer and says I have like 38 infections. The worse part is that it pops up every five minutes when I try to use my computer is there anyway that I can get rid of this... show more I just had my computer fixed a few weeks ago and now whenever I try to use it this box pops up that says system security and it'll scan my computer and says I have like 38 infections. The worse part is that it pops up every five minutes when I try to use my computer is there anyway that I can get rid of this system security and keep my computer safe i'm sick of spending alot of money every year Please Help!!!
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