Windows has been nagging me for several days to apply the latest updates. I did this morning (I think it's version 1809.) At the end of the update it rebooted, then asked me to select a keyboard layout (that's not a good sign), then several choices all of them bad: rollback (which doesn't work), or load a restore point (it deleted all my restore points), advanced diagnostics, or turn off the PC.
I managed to get it to reboot to Windows, but cannot do anything because my device drivers are gone, my desktop is gone, and the start menu does not load.
I do have a backup on an external HDD that is several month old. I'm going to try booting from a Windows 7 CD and using that to reload the backup, losing all my work for the past month (there's not much, but it's still really annoying) If that doesn't work, I'll have to download an install image and start over from scratch (and track down Acer drivers again, etc)
*expletive deleted*ck you, Microsoft.