Ok, I believe I found the problem.
The folder "C:\Windows\mui" which usually contains the multilingual files/folders is entirely empty. I believe that a long time ago I deleted the files because under normal circumstances, if you are only going to use English, they are unneccesary and at the time, I was short on space.
I'm almost 99% sure that this is the source of the problem. My new problem is where I can find the files -__-
Any ideas? I can't seem to find a downloadable torrent or something similar :/