New
#1
Hi, options:
1. Use a system restore point.
2. Restore your system from a disk image - you have discovered how invaluable the routine use of disk imaging is- so often recommended here- e.g. Macrium Reflect (free) + its boot medium + external storage for images - allows you to recover from many situations relatively quickly without tech. help.
3. Repair/fix:
https://support.microsoft.com/en-us/...t-menu-cortana
For assisted support, try the Start menu troubleshooter. After you've completed the troubleshooter, restart your device.