It might be a couple of corrupt disks, there's what...like 8 disks?
If you had BF1942 already installed before the new big install, see if you can
uninstall the old BF1942, then uninstall and reinstall the Complete BF again.
Also, don't forget the latest patches. There's 2 of them.
The "Full" patch and install the "incremental" patch too. Both here:
Battlefield 1942