OK guys I have sorted it and now feel like a complete numpty. The problem was that I still had the Yoostar 2 disc in my DVD tray. Even though I wasn't trying to run the game, ie I was trying to get into XeXloader, it must have still been reading the update off the disc whilst in the drive.
Sorry to have wasted everybody's time with such a basic error. Feel free to flog me or worse for being such a Dick !
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