deleting an xp partition

[mikekazik1]

Hi, I currently have 2 partitions on a single hard drive (each one is running xp). Could someone tell me what I should do to delete the one that is not used for booting up the os? I already went to disk management, but it's not allowing me to delete the partition from there.

 

[mikekazik1]

Should I try to use Norton Partition Magic to remove the unwanted partition? What are the risks?