Thanks for the response, PC eye.
I have read that using "Partition Magic" is best for partitioning, but I'm wondering if 'FDISK' alone will do the job. The thing is (I think), whenever I delete all the partitions I have (primary, extended, logical), the size of the primary partition C: seems to always be set, like I can't change the size of it (hence I'm wondering if I really do need something like "Partition Magic," or if I can just use 'FDISK'). Also, the size of the primary partition seems to be in the MegaByte range, not in the GB (or maybe there's some conversion thing I should be doing?).