Okay I finally managed to fix it by going to (Thanks to JacksonYarr)
<Drive>:\Users\<Username> \AppData\Local\GameMaker8.1\ extensions
and deleting all the extensions in the folder, then reinstalling.
Boggles my mind why an error like this would happen but at least there is a fix for it.
Edit: Realized I could have just edited my last post, oops.
Edited by Spyker, 16 May 2012 - 08:35 PM.
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