Mount the partition externally with a live cd and resize it to take up the entire disk. Commit and save your actions.
I have a hard drive that is divided in half. I previously Was dual-booting Vista and Linux, but I removed the Linux partition. I have Vista booting first on the MBR. I deleted the linux partition, so now I have the vista partition and 200 GB of free space. How do I add the free space to my vista partition?