Hardware

Hp does not post all their drivers online for some models you have to have the restore disk to redo the operation system. I have used this site before to obtian the disks needed but it is not free.

http://www.restoredisks.com/

Unless the Nvidia LAN driver is what you need.
http://h10025.www1.hp.com/ewfrf/wc/softwareCategory?os=2093&lc=en&cc=us&dlc=en&sw_lang=&product=3723209#N723

There may be no drivers for XP at all. But does either OS already have the driver? You may not need to download one at all.

The only way to get a driver for XP would be to get the exact Nvidia chipset name and try to find a driver at the Nvidia site, if it even exists. See the documentation or use this Unknown Device Identifier: http://www.zhangduo.com/udi.html

if it is
it only has a 10/100 NIC
(10/100 sucks)

according to this page:

http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c01421655&lang=en&cc=us&taskId=135&contentType=SupportFAQ&prodSeriesId=3677047&prodTypeId=12454

it's using a : Realtek RTL8201N

if you can't find the drivers either from HP or Realtek

a $25 10/100/1000 Gigabit add-on card will completely solve the NIC problem

one problem with OS downgrades is that only certain models are supported for this option

Thanks - I think I'll just go out and buy another card!