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Originally Posted by Waldie  now it's back. It's causing my CPU usage to sometimes go up to hundreds of percent usage, which I did not even realize was possible (obviously shouldn't be). |
With Task Manager (Processes tab), you can sort the processes according to CPU usage (click on the header), that should tell you which process is spiking CPU usage.
Have you looked at the Windows logs (eventvwr.msc) to see if there're any clues there too?