Dont be discouraged, most of the time i get a super smooth and action packed game. Its just occasionally that i get problems.
For the poster: The only thing ive found to fix problems with the disk is to swap the CD drives. But seeing as youve done this, my suggestion is seriously to return the CD for a new one. This might seem strange but i had this kind of problem with the game Mafia. Aparently a few of the disks were pressed with slightly bugged cab files, and when i got a new disk it installed completly fine.
Give it a shot.
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