Alright, so I had a 90GB partition holding XP, the rest was Ubuntu. I accidentally installed Windows late at night, and forgot it destroys GRUB, so I loaded my Ubuntu 11.04 DVD and used the repair tool. Now when I am on my Ubuntu System I try to use GParted to make that partition to about 500MB, but it doesn't allow me to re-size it. So how do I re-size the partition?
Boot your Ubuntu DVD as a live DVD, and run GParted from the live DVD desktop. Remember to set your BIOS to boot from the optical drive first.