Well...I ran a Windows Defender and Malwarebytes Anti-Malware scan(s). Malwarebytes found a couple pretty severe things and Defender didn't find anything; both ran full scans.

Also ran a diskcheck...

I am trying to figure out the cause of my extremely high disk usage. No matter what I do, the usage is anywhere from 80%-100%.

I've stopped and disabled the Windows Search, along with Superfetch....