KB3199209 Borked Start Screen

After this update:

1) all prior restore points are gone; and

2) I can't drag and drop to rearrange live tiles without crashing the start screen.

Nice work MS!

Try running sfc /scannow for an admin command prompt to check/repair your system files. Does the start menu work in other accounts? if so, you might have a corrupt user account. Are you making regular system backups e.g. using Macrium Reflect to easily recover from problems like this?

Thanks. SFC revealed no issues.

Looks like it is Nvidia's latest driver, 375.57, per thread in this forum.

Rolled back one version, 373.06, and the problem is gone. Apparently it is a "known issue."

Thanks again.