So this lovely game runs much too slowly on my pathetic machine. After 30 minutes of loading screens and 10 minutes of laggy shooting, I just gave up (sorry devs). I don't know why I've waited this long to uninstall, but I need some more HDD space, as my computer is pathetic like I said. But the "Add and Remove Programs" function to uninstall it won't work. I've also located the manual uninstall program in the game files, however, it does not work. It gives me this error: http://i.imgur.com/wrWvf.jpg (Linked because I couldn't use spoiler tags)
What do I do? I don't just want to delete the files, it doesn't really uninstall properly.

Thanks in advance