You have only one computer, and.....?  I've seen people on single-drive systems with drives as small as 300 to 500 MB construct multiple partitions.

Try System Commander or Partition Magic (or other free Partition managers) to repartition your drive without losing the current setup.  Or, make an image of the current drive and repartition using fdisk from DOS.   [I think DOS might have to be in partition 1 -- not 0.]