Hello Nicholas,
I understand your having issues after installing windows XP sp3 installing network drivers to the laptop. My Recommendations would be to use this link provided below to download all the drivers from HP.com to a disk, then take it to the laptop and install them. The following link provides all the drivers to your laptop. Let me know if the link down below fixed your issue, and if it didnt tell me what error your seeing in your device manger by going to my computer (right click),go to properties, device manager.
http://h20000.www2.hp.com/bizsupport/TechSupport/SoftwareIndex.jsp?lang=en&cc=emea_middle_east&prodNameId=3375995&prodTypeId=321957&prodSeriesId=3375953&swLang=8&taskId=135&swEnvOID=1093Good Luck,
Chris