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#11
You might have done well to mention that in the first place.
It looks like HP has XP drivers available:
HP Compaq 6720s Notebook PC*-* Download drivers and software - HP Business Support Center
As others have mentioned, there might be an issue with SATA drivers. I don't expect any problem, as you have an Intel chipset, but it would be convenient if you had a floppy drive on hand (to install drivers) just in case. (I believe that an external USB floppy drive would work.)