Did same thing on two different computers, one works the other doesn't.

1) DL'd alcohol 52% free version.
2) Created image of Warcarft 3 on both computers, mounted both...still ok.
3) Create image (mds/mdf) of BF2, CoD2, Rome, Halo, etc, all safedisc protected, correct? Was patient and waited for it to skip the bad parts. Seem to get image ok. Just want to preserve my disks because I have 4 young kids that like to scratch them.
Difference:
4) On one computer, when I mount the images, they all work perfectly fine. But on the other computer, it looks like the image will work, then for example when I click on Single Player in Call of Duty 2, it asks for the CD again.

On non-working computer have tried:
1)mounting images in Daemon Tools with using safedisc emulation. nada.
2)(and this I thought was fool proof) Burn image files (mds/mdf) from working computer onto CDRW, then tried to copy files from CD to non-working computer. But it gets to about 35% and halts. So I tried to fix the transfer mode from DMA to PIO only but still to no avail.

As you can see, I'm quite new to it all but I do my homework before coming and posting. At this point I think it's my Drive, I'm not confident it's burning the images correctly because it can't even read the images I burned from the other computer which I copied to a disk. It is a Samsung DVD Burner model SH-S182M/BEBE.

I'm ready to go and buy another drive but don't want to come home and have it not work also...please advise!