A family of Microsoft word processing software products for creating web, email, and print documents.
It is very unlikely that unhiding the AppData folder caused the issue.
However, it sounds like there are some corrupt files in the Word Startup folder under AppData\Roaming\Microsoft\Word\Startup Either delete them, or move them to another location and then start Word. If it then starts OK, you can move them back one at a time until you find the one(s) that are causing the problem.