XP has in the administrative tools all you need to split a hard disk. I know they have it on XP Pro but am not sure if it is on XP home edition.
Check in administrative tools/computer management/storage/disk Management the Help tab should give all the information you need.
Asus P4P800 SE
Intel P4 3.2 Gig 1024 Meg PC3200 cas latency 2.5
RAID 0 2-36.7 Gig SATA WD 10,000 RPM
200 Gig WD ATI ALL-IN-WONDER 9600XT
6500 Kb bandwith Internet Connection