Please try to return to the login screen
While holding the Left Shift key, click the Power icon at the bottom right > Restart
This will bring you to Windows Recovery Environment
Select Troubleshoot > Advanced Options > Uninstall Updates
Uninstall latest quality update
If this doesn't work, Select Troubleshoot > Advanced Options > System Restore
Select the restore point at an earlier date where everything is still working.
Click Next then Finish