How do I properly partition my hard drive so I can dual boot Ubuntu and WinXP?

I've got an FAQ that tells step by step what to do. I choose the partition and then set the size, but then it always goes back to the screen with the partitions without my changes showing. I'm using the FAQ here:

https://wiki.ubuntu.com//WindowsDualBoot



I get stuck at sub-step 5 under main step 7. After it says, ';It may take some time to apply the changes'; the screen almost immediately goes back to the screen where it shows the partitions.



Does anyone have a clue? Or another URL with more help?How do I properly partition my hard drive so I can dual boot Ubuntu and WinXP?
According to the website Ubuntu has issues with resizing NTFS file system which is the file system of XP. There is a secondary procedure listed, have you tried that? And if you have already tried that and have no other options you can use partition magic. I used partition magic many times for my dual boot systems and it works great. It does have a $70 price tag though.