I am running XP Pro SP2 and exile wont install. i know that when i first bought the game it installed fine and i could play it on XP but now when i choose full install it hangs at 21% for about 3 minutes and then says "You are now exiting the Myst III: Exile installation. Some files may be left on your system. To install Myst III: Exile please run the CD again." and only has an OK button to click and then closes the install and on the typical install it hangs at about 81% and then says the same message. i have my anti virus off when i'm installing and no other programs are running. any help?