Jeg kan se at dit motherboard anvender VIA K8T800 Pro + VT8237R chipsettet. Drivere dertil skulle iflg. VIA være indbygget i WinXP64.
http://www.viaarena.com/default.aspx?PageID=420&OSID=2&CatID=1080"The drivers contained in this beta package (except for the SATA/RAID drivers) are built in to the final WinXP64 operating system. This package is no longer needed. Drivers for the VT8237 SATA/RAID controller can be downloaded from this web site by searching under WinXP64 > IDE, RAID & SATA > VT8237 Integrated SATA RAID contoller."
Denne driver kan hentes her: 
http://www.viaarena.com/default.aspx?PageID=420&OSID=2&CatID=2560&SubCatID=143Desuden har du en ekstra SATA RAID chip på motherboard i form af Promise PDC20579. Der er ingen direkte XP64 drivers til denne chip, men det siges at en af følgende tre drivers virker:
http://www.promise.com/support/download/download2_eng.asp?productId=137&category=driver&os=0&go=GOhttp://www.promise.com/support/download/download2_eng.asp?productId=165&category=driver&os=0&go=GOhttp://www.promise.com/support/download/download2_eng.asp?productId=129&category=driver&os=0&go=GO