A virus in my windows and I don't have an antivirus program installed

  • Thread starter Thread starter Dark91
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Dark91

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Hi, I'm George, and this is my problem. 6 or 7 months ago I upgraded my windows 7 to windows 10 I had no problem but recently, the computer got slow I tried to format it but it's still slow. Whatever, I installed Windows 8.1 and it was fine. I think that the computer has been attacked by a virus because of the suspicious ads. When I open the PC, it takes more than 25 minutes, and after this, I enter the password and enter the computer, and I can control my PC for only 3-5 minutes, and then the computer freezes and I cannot do anything.
how can I fix it, can I do anything to remove the virus in 4 minutes. I tried to delete it by cmd but I don't have enough time. I want to try to open cmd in the loading screen but the keyboard just turned on in the welcome screen.

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