Just to clarify.. Did you use the hardware RAID functionality or the software RAID (called striping in XP)?

If you use the hardware RAID, any OS loaded would see the RAID0 array as 1 single disk..

To restore it you should go into the RAID hardware's BIOS and recheck those settings.. Also recheck the order of the physical disks.. Make sure they're still connected to the same interface and in the same physical order..

NB Rebuilding is not an option with RAID0... Only with RAID1 or 5..