I just had the same problem... Its because you installed windows xp with out sp2 on the disk heres a little bit more info on your problem & how to slip stream sp2
Slipstreaming XP with SP2
That's not necessary anymore
Originally Posted by peterhuang913
That's not necessary anymore.
It is if you try to install windows xp with out sp2 on the disk it will not let your partition the drive larger then 137gb
eitehr way you can still use software to extend the drive as long as you have sp2