I've seen such on laptops but never considered using them on a desktop.
-> How about the common overlooked drivers such as motherboard and SATA drivers. These are not on the XP CD and widely documented as needed during the install. I see no reference to these in your post.
Have rebuilt my desktop, new mobo, 160G HD, 1G Ram. Mobo is a fujitsu that is listed on the HCI, but needs external video card - using Geforce. Win XP-SP2 from Tiger/OEM version.
Did the install/format Hd, install finishes, restarts and does a particial boot -- Win XP main screen comes on, then screen flashes over to a poor quality XP main screen, and halts. Restart in Safe Mode, boot starts but when main screen should appear, horiz. lines and blue text type symbols, as if Geforce video card not being functional.