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might be a cd protection problem, some fancy protections diddle with the CD's slightly, rendering them useless on a few systems.
call the maker and tell em, they sometimes have unprotected ones for this problem, or a refund.
otherwise your drive might be ever so slightly out of calibration and those disks ever so slighty off too, and the combo of the two equals unreadable disks, on your friends PC make a duplicate if you can and try those, but first check the install with the dupes, if it fails, its protected so wont work.
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