Hi ArtEric,
Welcome to the Apple Support Communities!
We understand that you're unable to scroll and highlight text in Microsoft Word any longer, correct?
Do you experience the same behavior in any other apps such as Notes for example?
If you create a new user account and attempt to select text in Microsoft Word, does it respond as you'd expect?
To create a new user account, you can go to the Apple menu > System Preferences, then click Users & Groups.
Click the lock icon, then enter an administrator name and password.
Click the add button (+) below the list of users.
Complete the fields shown for an Administrator account, then click Create Account (or OK).
Once you’ve created the new account, go to the Apple menu > Log Out, then log in with the new account and test Microsoft Word.
We look forward to your reply.
Cheers!