I have successfully installed Windows XP Profession on an HP computer (p7-1410 desktop) - wonderful learning curve! A senior client panicked when his computer died!
I have been able to download most important drivers (the computer came installed with Windows 8) for the hardware except for the DVD Writer Model SH-216 (HP model: XH-216BB/HPTHF).
I have searched and have had no luck. HP does not supply drivers for XP.