oh, after you change the text to what I said, be sure to click on "file" at the top and click on "save", otherwise your changes will not be saved and it won't work
edit: forget what I said about going into Disk Management, it looks like the Windows 2000 and other Operation system is on the root of the C drive, so if you want the extra space, just go into "my computer" click on the C drive and delete the WINNT folder and the Microsoft Windows folder
I'm curious, have you booted into the "windows" operating system...You said you have Windows XP and Windows 2000 Server, but when you boot into the other one, what Operating system is it?