It seems I have corrupted OS files and my PC is slow to react, can’t open Microsoft Store, unable to update in Windows Updates, and the disk shows 100 percent in Task Manager. I reset the PC with keeping the personal files which improved the speed just a bit, but all the problems still remain. After running sfc /scannow, I saw that I still have corrupted files. Is it possible that the PC has a rootkit or is it something else?
step -1go to task manager by using taskmgr.exe command
and check which process is consuming maximum CPU usage
and end that process then check.
run cleanmgr.exe tool for disk cleanup, it will remove all the temp files.
step - 3
run dfrgui.exe to run fast your computer.
step-4 check virus with update anti virus.
Check this link for the solution