stealer,
If  your XP doesn't boot at all, why not download the XP boot disk as referenced above, use it to boot your XP, then do whatever you wish with system restore ?
If XP had DOS you could run 'restore' from DOS, but XP won't have dos unless you patch it in someway.
The link above will give you a XP bootable disk, once booted use the command line for system restore.