New
#21
Turn off Windows Updates for awhile, monitor overall performance, and then see if issue repeats when you turn it back on.
If so, I'd run a Repair Install
You can also open a case with MS which supports Updates via email from the WUD website.
They once walked me thruogh about a dozen possible fixes over an entire summer on a friend's computer, until it fixed - relentless.
Never be scared of your computer.
Be informed and then be aggressive.
Good work.