So I have a fresh install of Win8.1 LEGAL copy (it's about 2 weeks old) I noticed yesterday abnormally high CPU usage. ~40% in task manager when the computer is doing nothing. After some investigation, most google searches are telling me it's a driver issue, run a trace this or that. It looks like the process is simply "SYSTEM". Okay -- so a few more details. When I do a fresh reboot, the issue doesn't exist. Super low CPU usage 1 to 3%. Wifi works, everything is working as it should. If I don't do anything, i.e just let it sit for 5 to 10 minutes, CPU usage will spike to 70%, soon as I move the mouse it will fall down to 50% then to 40's. Another byproduct of this problem, is when I do a restart or shutdown, it will go to the restart screen with the rotating circle thing and sit there, not a hard crash, but will just sit there spinning forever. (I'm forced to do a hard reboot). This issue does NOT happen if I reboot in the first few minutes of starting windows, before this unknown process/thread takes root. Did a full virus scan, and malwear scan, even uninstalled Acronis. I've disabled my wifi adapter, all the normal programs I use (dropbox, evernote, afterburner). Just reinstalled the latest video drivers. Still confused as to why this is going on. I've used process explorer to poke around but still can't get to the root of what's causing it. There doesn't seem to be detailed instructions I could find that shows you step by step how to identify the driver or the program that's causing this. Any and all help is appreciated.