You need to install Chipset drivers. The Chipset are located on the motherboard and they control your graphics Card and other stuff you require drivers to help XP to "talk" to the chipset otherwise the system becomes unstable.
These links are to all the motherboard drivers...
Sound:
http://dlsvr01.asus.com/pub/ASUS/mis...0/WDM_3663.zip
Chipset:
http://dlsvr01.asus.com/pub/ASUS/mis...s/4in1_449.zip
USB 2.0:
http://dlsvr01.asus.com/pub/ASUS/mis...0/usb2v252.zip
Onboard LAN:
http://dlsvr01.asus.com/pub/ASUS/lan...vialan8201.zip