Hmmmmm.....I wonder if on your cd you have a seperate "i386" folder.
Cuz that is the folder with the xp install files....if you could copy them to a different disk......or even make the xp install floppies...you may have a chance.
In other words what you usually do is install the new board..then boot off of the xp cd and do a "repair" install....which means you proceed like a fresh install but it searches for and finds the current windows install and asks if you want to "repair" that install......that is how you go about it when you swap motherboards....otherwise you just will get a blue screen if you try to boot with the new board.
Soooooo, the question is.....can you do that with your OEM re-install disk. Dell gives u a reinstallation disk but it is basically just an XP disk....then they give you other disks for the applications etc. If HP did it that way it'll work.
But if they gave you a cd with a "image" of the OS with all apps installed etc....it probably wont work because it will still just be the drivers and registry entries for the old motherboard.
Thats why I suggested trying to see if the i386 folder is on the cd anywhere...perhaps you could boot off of floppies instead and then navigate to the 1386 folder and install directly from there.
Another option is just to borrow someones XP cd and use your product key.
The snag their might be the fact that you'd probably have to re-activate windows and since it was an OEM Windows they might not want to re-activate it...since OEM stuff is supposed to be FOR THAT MACHINE only....so they might say if it changed enough to need re-activation, then its not the same machine.
But surely if you tell them that you just upgraded the mobo..they would hopefully go along with it.
JP
Otherwise XP Home can be had for $85ish plus shipping---> here for example
http://www.saveateagle.com/micwinxphome1.html 
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