I recently had to reformat my computer and have been reinstalling all the programs just fine from the CDs. I have been reinstalling FFXI today, and had no problems until the ToAU expansion disc. There are no problems with the disc itself as my other computer can read and load the files just fine. I installed it from this same CD back when the expansion came out on both computers as well. However, with my Dell computer, neither of the Samsung drives (DVD-ROM 616T and a CD-RW one) will register that the disc is even in the drive. No auto-play/install comes up; tried to use run option from start menu and says to insert a disc into the drive, and so on. I checked with Device Manager to update drivers for both and it says that all drivers are already updated, and I used a CD/DVD cleaner just incase that may have been the problem as well. No error codes are coming up either. Just this one disc does not seem to exist for my computer.
As side note, I have done all Windows and Microsoft updates as well in case that has anything to do with this.