HP's website would be the place you want to go. Enter in the SN of your unit, you should be able to quickly get to a page with all the drivers for that unit. Of course if you tried installing XP on some unit that came with Windows 7 or 8 on it, then you are stuck trying to figure out the individual hardware components, and hoping that the component manufacturers have XP drivers.
I installed windows xp sp3 professional 32bit, version 2002, on a hp desktop.
After the installation, I connected a ethernet cable from the desktop to my wireless router but I can't get any internet connection.
I looked in the network options, and I only see a 1394 connection.
I checked my device manager, and it showing this:
Which means all those with yellow question marks are missing drivers.
How can I install those drivers? Like where can I get them?