This: "So I reboot the computer trying the NTBR and get an error message "Can't open CD driver CDRCACH shsucdx can't install. ERROR: Failure loading; unable to find CD-ROM drive! " we can bypass using another method, but that will most likely break your ability to access Dell's recovery partition. I'm curious, if you can access it now. Can you check? If not, we can go ahead with fixing MBR in different way.