Flash Drive BSOD Mystery

I recently moved my XP Pro system from one computer to another, doing an in-place upgrade to have XP recognize the new hardware. All went OK except for this problem: Whenever I insert a large flash drive, the unit immediately crashes with a Page_Fault_In_Non_Paged_Area BSOD. The USB drivers are up to date, and other devices (like a printer) work just fine in the same USB port. Ports on the front and back behave the same way.

Even stranger is that an old flash drive (16MB) works OK, but the newer, larger ones (1, 2, 4 and 8 GB) cause the immediate crash. I tried to format in FAT and FAT32 with the same result. I've removed all USB related items and re-loaded USB drivers with the same result. The flash drives work fine in other systems. I loaded a copy of Ubuntu on this computer and the flash drives worked perfectly. I'm at a loss as to what to try next.

If you have any ideas, I would appreciate your thoughts. Thank you.

Sorry it took so long to get back to you. Thank you for the suggestion. I did as you recommended and ran mem86 for 3 passes. No errors at all. To add to the mystery: First, I did an in-place reinstall of XP -- same problem. Next, I have a boot analysis disk (Hiran's disk) which has an abbreviated Win XP desktop. Using this, the USB ports work fine with all my drives. Finally, I loaded Ubuntu on this unit and again, the USB worked fine. Now what?? Thanks again for the input.