The deleted Microsoft Office files you mentioned are the Microsoft Office app's preferences info. Once an app's preference data is removed, the app won't work under the previous setting.
I guess the original locations of your deleted files are:
- com.microsoft.office.licensing.plist - perhaps belongs in /Library/Preferences
- com.microsoft.office.plist - perhaps belongs in ~/Library/Preferences
- com.microsoft.office.setupassistant.plist - perhaps belongs in ~/Library/Preferences
- MicrosoftOffice.mdimporter -- this a folder perhaps belongs in /Library/Spotlight
You can open Finder and click on Go on the upper menu bar > Go to Folder. Then enter /Library/Preferences and ~/Library/Preferences to find the two folders and put the Microsoft Office .plist files back to their original location. After that, you can access your Word files and go on using Microsoft Office as before. Good luck!