.LNK problem

I downloaded this program "Play it All Media player" thinking it would help me with playing my home made video. It didn't. I uninstalled it, all my folders and icon became .lnk. NOTHING worked. I restored it by the method I learnt on this site. Everything worked. I uninstalled again, it "crashed" my computer again. I don't know much about computers. I have restored it again, waiting for salvation. Is this a virus? Any help out there?

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