Random freezing - Infected?

Hi GeekPolice, I'm having a problem. Shortly after windows starts up, my computer freezes for about 10 seconds (sound loops, keyboard & mouse not responding, everything), and does so every minute. Sometimes its shorter/longer or frequent/less, but you get the idea. It even affects the opening of applications sometimes, I cannot even shutdown properly because it would permanently freeze when it says 'windows is shutting down'. Anything you can do to see what ails my computer?

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