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I hate to tell you guys this but IT IS A MAJOR VIRUS.....I had the same thing happen to me today as well,at first I thought it was my computer but I saw the 10 o'clock news and they said there's a major worm going through alot of peoples computers and it has cause the computers to shut off then come back on again ,over and over, so it's a real thing....they said if it happens to your computer go to window updates and scan your computer on their updates site and it will give you the software needed to help fix it,also they said to scan with an antivirus software, because if you don't you will have to take it in to get fixed,it is that bad...I found 4 viruses on my computer today andd the software I have killed them....(I hope they don't come back)