Windows insisted on updating my Windows 8.1 installation. It said save your stuff, we're rebooting in 14 minutes! Now that's annoying, but even worse, after the reboot, it ran slow as molasses in winter.
I finally figured out what was wrong. I ran Task Manager and clicked on the Performance tab. Down at the bottom is a button/link for the Resource Manager. I clicked that and it showed my C: disk, not full, but being used 100% of the time. Sure enough, the disk light was on almost continuously. Something funky with the C: disk!
After googling about this, I ran (in an admin level command line) chkdsk /r/f c: and then had to reboot for it to take effect. This command checks and repairs the hard disk. They tend to fail after about 5 years. Anyway, this ran for HOURS stuck at 12% but finally completed and the problem was fixed!
So yay for chkdsk.
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