Assuming you on Windows 7.
Yes you can :). Go to start menu >> search "disk management" and click >> At the bottom should be your "C: Drive" with a blue line above it. Right click the block >> click "shrink volume". Shrink it by how much you wish to put on the next drive. There should be a block with a black line above >> Right click and say format >> There you go.
Note: You must have Administrative Privileges to do the following way.