Expand my Drive C: Partition

Hi Experts! My Hard Disk crashed so I was forced to buy a new one with the new set of recovery disks. I installed everything correctly but even so, I cannot get the full access of it with the Windows Vista Disk Management. I want to extend the C: partition so I can use the 164 GB free spaces. How can I do it? And also, I want to know what ST_SDV (D) drive is. Thanks.
