Windows 10 Corrupt Tile repository / Windows button does not work
!!! See the last sentence first!!!
The TileDataLayer folder is placed at C:\users\'username'\AppData\Local
1. Create a new account on the PC. (eg. Test.Account) (Or log in as different account that doesn't have the same issue)
2. Login as the new account.
3. Reboot the PC.(I haven't do that)
4. Login as an administrator (NOT the affected account or the new account)
5. Copy the vedatamodel.edb file from the new test account to the account that is having issues, overwrite the file. (I copied the all database folder)
6. Reboot the PC. (I haven't do that)
7. Login to the PC as the account having issues.
8. It should now be the default start menu layout.
The source of this solution is here
!!! In last several cases I just restart the Windows explorer from Task Manager and the problem disappears. !!!
Also you can try: cmd as admin; sfc /scannow; restart. It fixed the problem once on 14.01.2019
