Hello! My name is*****
To confirm, the problem you are experiencing is present on your Windows 10 computer, or on another computer?
It looks like Windows 10 upgrade didn't go well. There is a way to access the repair options and refresh the Windows 10 installation while keeping the personal data intact. It is one of the repair options that can be accessed without the Windows 10 disc. I am sure it will solve the problem with the Start Menu.Here are the instructions on how to refresh the Windows 10 installation:1. First, go to the Windows 10 logon screen. To do that, just restart the computer2. Once you see the logon screen, do not select your user name or type anything, but look in the bottom right corner of the logon screen. You should see 3 icons. If you don't see any icons, then just click anywhere on the logon picture and then check again3. Click on the power icon and then press and hold down the Shift key, and while still holding, click on Restart4. Continue to hold down the Shift key until you see the Choose an option screen5. On that screen, click on Troubleshoot6. On the next screen, click on Reset this PC7. On the next screen, click on Keep my files8. The computer will restart. Follow the instructions to proceed with the reset. It will take up to 30 minutes to finish. That process will rebuild the current Windows 10 installation while keeping the personal files. Some programs may be uninstalled in order to complete the process. If the original problem is gone, you can re-install those programs.
If you encounter problems, I am here to help you further.
Do you still require assistance with this issue?
Let me know,IT Miro