First things first. If XP does not show InCD in your Add/Remove programs you don't have it installed and not to concern yourself with it. InCD is separate from Nero and is optional so it does not install with a new installation of Nero.
Next regarding the Liteon, I am really confused now. You say you have two PC's, one with an NEC, that performs correctly, the other with a Liteon that I assume is recognized by Windows as Liteon, yet it has a firmware of UTS2.
UTS2 is an original OEM firmware that needs to be updated.
You said " I down loaded the firmware from Lite-On for an 812S but when you try to upgrade it gives an error saying the drive is an 812S UTS2 ( UTS2 is listed as the Firmware Version in DVDInfopro). This drive was installed in an emachine so I called them to see if they had a firmware upgrade. They didn't and told me I had an NEC drive in my model."
Who did you call, the PC manufacturer? I checked NEC's firmware and they all are numerical such as 2.18, 2.16.
I suspect that the firmware is most certainly at fault here, if it is a Liteon drive you certainly have the old firmware. With Liteon's own firmware you cannot do a backwards install of their firmware, only forward. Example, USON was earlier firmware, if you install USOQ (current) you can't go back to USON. I don't know why you can't instal the USOQ firmware. There is a hacked Utility that you can try that changes firmware for Liteons, the link is here: http://club.cdfreaks.com/showthread.php?t=97590
DO NOT ATTEMPT TO USE THIS UTILITY UNTIL YOU CONFIRM IT'S A LITEON, IN ADDITION READ AS MUCH AS POSSIBLE AT THE THREAD AND DOWNLOAD THE CORRECT FIRMWARE.
Before you do anything you must identify your drive, if need be, pull it out and see if you can identify it from ID marks on the case.
Did you install this drive or did it come with the PC, I need more information to help you. What firmware does your PC with the NEC display.
If incorrect firmware is installed it can ruin a drive so we must have as many facts as possible.
Maybe its best that you send me a PM and I'll try to help you, makes no sense posting here since your problem will not benefit others who read the boards for information. If need be I can email you the proper software if it is a Liteon 812S