Microsoft's answer to fixing to small, almost negligible problems, with Windows 10 is like killing a mosquito with a sledgehammer.
After an update, that 'succeeded', I noticed task manager wouldn't run. Since I subscribe to "Assure", I hopped online, and told them this one itty bitty problem.
Well, the first tech tried to do an "in place upgrade" which had no good result. Got to 17%, the the computer rebooted, got the message "UNDOING CHANGES MADE TO YOUR COMPUTER". Ok, Task Manager still not working, but I tend to use Process Explorer.
Then I noticed my Bluetooth was no longer working. It had the day before, as my graphics tablet was is bluetooth, and I was editing photos with it.
I checked device manager: yup, Bluetooth device is there, but driver not loading? WTF? Ok, off to Asus, and get the proper signed Windows 10 driver for it. Nope, still nothing.
Again, I head on over to MS Support, and not only do they NOT take the sfc/scannow and DISM logs, they're advice is just to nuke it from orbit. Only way to be sure. Ahem, do a full HDD wipe and reinstall. I really miss the way Windows XP did backups. If you had a corrupted file, you could load up your back up and MANUALLY copy the non-corrupted version right on over.
So, now it's a matter of picking a date and time, email serials and license numbers, deactivate programs, and doing a full blown reinstall. Oh effing joy.
On an aside: The bluetooth and task manager work fine on Windows 7 drive.