I just opened the GalCivII CE and the cd-rom is not scratched in any way and i my pc is newly installed with WinXP PRO SP2 but when it gets to 33% it says "An I/O error occurred while installing a file. this is normally caused by bad installation media or a corrupt installtion file." I switched off all background programs, my firewall and antivirus, and switched cd-rom's and get the same error