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How to fix my computer?

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My computer has been acting really strange lately. But ever since I got it there seemed to be something wrong with it but lately its been really bad. My computer shuts down like every ten secs randomly and if im playing a game on it it randomly turns off the game or freezes all the time. I dont have an internet connection on that computer either so I couldnt have gotten a virus from that... And a few months ago I downloaded kaspersky securty or something and its an anti virus system and it did find like 66 viruses and fixed them but whenever I do scans it says there are no more viruses. And yet my computer stinks. And I dont know what to do. Is there anything I could do to fix my computer ? Because now I cant even change my background or anything like that, it wont let me open some word documents, and it freezes/shuts off out of nowhere.