System and Boot volumes

I think this is more software than hardware, but here it goes....

I just setup and configured a Windows 2003 Server. I used one 36GB disk to install on. I setup two partitions, one 10GB in size, the other is the remaining which is about 24 GB.

I installed the OS on the 10GB partition, it is the C drive. I formatted the 2nd partition in Windows and set it to the D: drive. I labeled it Storage.

For whatever reason, when I open the Disk Management console, and look at the disk, the C drive is labeled as "boot", and the D drive is labeled as "system". I don't mean the label that I can change that shows under My Computer.
I want to change the drive letter of D but I can't because it says it is a system disk. I didn't do this intentionally, anyone know how I can change this w/o reformatting? Are there files I have to move? Any help is appreciated.