do you checked your task manager? 100% CPU or 100% disk usage?
Your CPU cooler is cleaned from dust? Otherwhise it will overheat and reduce the power of the CPU.
I got yesterday a problem with my disk which was running @100%. May you got the same. In the ressource manager you can check what programs are reading/writing on the disk. If theres a program called WPR open cmd as admin and type WPR -cancel. It will stop it and your pc is running again.
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