I was able to fix this problem by doing the following:

1. Uninstall Final Fantasy XIV.
2. Download a software cleaner (CCleaner).
3. Run CCleaner and restart PC.
4. Redownload Final Fantasy XIV client & game.
5. Login and start up Final Fantasy XIV.

The link to download the launcher/client is here:
https://www.finalfantasyxiv.com/playersdownload/na/

It's really a pain to find it for some reason.