First step: take the Windows copy CD to another computer, pop it in the drive, and try to browse the contents. This will confirm that there is indeed stuff written on it, and it will tell us if the CD is protected in some way that would generate the access denied error. OR, is there anyway to get your hands on the original Windows CD?
Do you have a floppy drive on the PC that won't boot? There may be another way to get those files copied using a boot floppy.