I don't use XP but I guess it is not much different as most windows versions.
Go to the hardware section and choose add new hardware, soundcard, then instead of windows looking for new devices choose the path where you extracted the delta files, it will now automaticly detect the drivers.
Take care,
Fred
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Keyboards/Sound Units: Kurzweil 2600S, Roland VR-760, Acces Virus C, Roland G-800, Akai AX60, Minimoog, Machine Drum, Roland R8-M, mediastation x-76