Drakonis is completely right, is that what i said before, but i don't think you need to do all these steps, just boot with win98 disk and format the C: unit, after of this, give the boot with windowsXP cd and reinstall it, choosing the options to change the partition system to NTFS, just copy the cabs if you want, but will take a good time to copy all cabs.
After of the c: partition is with winXP installed with NTFS partition you'll be able to learn the other 3 partitions.
Maybe is because i didn't had explained correctly before.