On starting MS Office, the update screen may come up and get stuck.   To fix this, hold down the power button until the Windows logo appears, then release the power button.

Additionally, you can turn off Office Updates to ensure this does not happen in the future.   There are several ways to do this:

1. As you mentioned, the first way is open an office application>File>Account>update office>to disable office update.
2. The second way is opening Settings> Update & security > Windows Update> Advanced options > Turn off the option labeled Receive updates for other Microsoft products when you update Windows.
3. Besides, you also can Open the Windows 10 Store app> Click on the three dots icon and then click Settings> App updates> turn off the Update apps automatically option.