How to increase system partition

Hello,

I'm on Win7 Prof. 64-bit. On a 1TB drive, I have the following partition layout:

System Reserved (Primary)
C: (Primary)
F: (Logical)
G: (Logical)
K: (Logical)
Z: (Logical)

C: is the system partition with ~ 5GB free which I want to increase. I have ~ 300GB free on Z. How do I increase the system partition C: with free space from Z: with Disk Director 11 Home.

Thanks,
Thomas