Hi robby256.
A single 500GB partition is ridiculously too large to manage. It's best if you break it up into several smaller partitions.
For a limited and unknown period of time a free version of Partition Magic 8.0 can be downloaded.
Download Partition Magic 8.0 Free Trial - Allows you to create, resize and merge partitions.
PartitionMagic - Wikipedia, the free encyclopedia Info on PM and its history.
With PM8 you can subdivide a hard drive into multiple partitions (each will have its own drive letter). Make only "Primary" type partitions to stay out of trouble.
The "magic" part of PM is that is can resize and existing partition with data on it already and
preserve all the data! XP's utility DISKMGMT.MSC will destroy all the data when it resizes a partition.