I took the advice from the official who responded to use CCleaner. Big mistake.

I'm actually going to go ahead and say under NO circumstances should you use CCleaner. My computer was running fine besides FFXIV borking. Now I'm getting massive spikes in CPU and GPU use after it "removed all the bad stuff." I had to run a CMD scan to fix the corrupted files. Seems to have been fixed, but if not I'll have to do a system restore or fresh installation.

DO NOT USE THIS APPLICATION.

If you did and your stuff is borked, follow this:
In your search box of windows type CMD.
Right click on the search result Cmd, and run as an admin.

In the command prompt window type: sfc /scannow.