Thanks for the speedy response. I have some more information that I'd like to ask about.
I looked at the settings for the virtualized server and it shows 2 drives. Hard disk 2 seems to be the mapped Compellent drive, which means that Hard disk 1 is the virtual drive. It currently shows a provisioned size of 30 GB. Does this mean that the former IT manager tried to do what I'm currently trying to do but without success (since the C:\ drive still only shows 15 GB of space)?
If that's the case, then would I only need to increase the size of the partition using the extpart app you mentioned earlier?
Thanks again,
Ian