You can reformat it, but if you don't want to go through that process, get a program like PartitionMagic or something. It can resize your partitions so you can make new ones. I use it and it works wonderfully.
You could always coughbytetarrantcough Partition magic.
well if you use that use the "real verison" that's all i'm going to say
Gcard:XFX Geforce GeForce 7900 GT EXTREME (520MHz)
Ram:PNY OPTIMA 2GB (2 x 1GB) 184-Pin DDR
cpu:AMD Athlon 64 3700 2.2ghz oc to 2.4ghz
please don\'t ***** about how laggy you are on FEAR i beat the game on 640x480 at 20fps!! old computer(pci radeon 9250)
so please save your computer hardship about framerates unless your have a card lower than this