Good News !
Thanks to the both of you, you were exactly right. "Needing the Drivers" was something that I suspected, but I thought that the only way to get them was off the Lenovo Factory Restore Disk. But the next post mentioned
"AHCI" which is something that I have seen/recognized in various BIOS's, but never have had to deal with.
Turns out, that was the problem and the solution. I went to BIOS, flipped the switch from "AHCI" to "Compatibility" and instantly on the next reboot the Windows XP Professional (Upgrade) Installation Disk was working just fine, with no BSOD.
So thank you very much. You had the exact piece of information at the exact right time. I've got until 8:00 a.m. tomorrow to get this thing downgraded, updated, AV installed, optimized, etc..., so I've got to get to work. Thanks again.