Extending partition size in W2000 Server

try using this tool. But i would recommend not trying to extend your c drive. Also move your page file away from d: if it is running there

http://www.ranish.com/part/

Try Paragon Partition Manager which will work on Servers and Dynamic disks:
http://www.partitionmanager.com/

Not familiar with PERC, but have done it on a Compaq Proliant using the integrated Smart Array controller. Started with 2 disks Raid0 as C:, 3 Raid5 as E:. Added a disk to the chassis, told the controller to add it to the Raid5 "volume", waited for the controller to finish rebuilding all the stripes. Windows Disk Manager then saw the "physical disk" reported by the controller as larger with the original sized E: partition. Ran DISKPART to extend E: to the rest of the "physical disk".

From the description, the partition layout is like below:
C D Unallocated
In this situation, you can only extend partition D by diskpart, to extend C, you need a tool to move D rightward, then you can expand C. So you need third party SW and there are many such as easeus, acronis, paragon, etc.
You may also check this article http://www.partition-tool.com/resource/repartition-server.htm