Look for CatRoot2 (xp throwback)
If this is on you PC (W10 home version) your Windows Update has broken at some time in the past. The Fall Creators update completely trashed my AMD machine, and I (to cut a long story short) created a new user profile and copied all the shortcuts/files from the broken profile across to the new one. *Everything* was copied across without reinstalling Windows. I then made sure that stuff was working in the new profile before deleting the old one. I also turned off the "fast boot" option. This took two weeks of testing.
All the stuff on support websites (including Microsoft) didn't work, as some programs fired up properly (whereas others didn't), the task bar was broken, but after several reboots it would work properly as if nothing happened. Then stuff would start going wrong again. A mish mash of anything I could find helpful actually worked. However, it has been fine since last year.
The April update has gone through with no problems and appears to be dribbling slowly out of Redmond, and my machine now boots faster. If you're having problems with WU, go here:
This will give you standalone installer versions and it runs like XP WU did. It is imperative that you match up the KBXXXXXXX with that of those detailed in WU. In my experience this fixes WU as it updates the update catalog. This also worked on my sister's laptop.