Alright, I have just tried the Ashes Cricket Demo version and it has worked perfectly, then tried the Ashes Cricket game and it had slow down still. To me this suggests that the problem is not system related.
I thought I would try and uninstall and then re-install the game to see if there was a corrupt file, however when I tried to reinstall the game the installer seems to think that the game is still installed, as it only offers the option to modify, repair and remove, furthermore, selecting any of these options gives me this message "Error: -1605 This action is only valid for products that are currently installed." and thus I cant reinstall the game now.
Anyone had similar problems or know how to sort this.