Surprisingly simple idea, and effective to a fault. It now attempts to uninstall to C:\ with the same exact problem.
Not enough storage is available to process the command [click okay]
installation did not complete [click okay]
Just for the *censored* of it, I'm going to restart my computer and try it again. A search of the error on google lead me to a few boards, none of where were resolved outside of World of Warcraft error and a few people whose installation problems were caused by Vista incompatibility. If I don't post again immediately, it's safe to say restarting did nothing.