[Miracl3]

i backed up my doom3 so me and my wife can play together and everything installed right but when i try to run it on her comp it says PLease Insert Doom 3 disk 1 when the backed up disk1 is already in there.....anybody ahve any info on this? someone said something about i might need to replace the exe...but i dont know much bout backing up...first game ive tried to backup so far