URL

Chipset
ftp://ftp.hp.com/pub/softpaq/sp26501-27000/sp26505.exe

VGA, Graphic
ftp://ftp.hp.com/pub/softpaq/sp26001-26500/sp26496.exe

Sound, Audio(from website realtek)
http://www.realtek.com.tw/downloads/downloadsView.aspx?Langid=1&PNid=24&PFid=24&Level=4&Conn=3&DownTypeID=3&GetDown=false#High%20Definition%20Audio%20Codecs

(Windows 2000, Windows XP/2003(32/64 bits) Driver only (Executable file), r1.89)

LAN, Network
ftp://ftp.hp.com/pub/softpaq/sp26501-27000/sp26518.exe

Modem
ftp://ftp.hp.com/pub/softpaq/sp26501-27000/sp26501.exe

Multimedia Keyboard
ftp://ftp.hp.com/pub/softlib/software5/COL13021/pv-36347-1/sp26504.exe