[wizbones]

You say you have a C and a D drive already, do you know if you have only one hard drive or is it two?

I am going to assume you are running windows 95/98 here. So do a restart and as soon as you see the starting windows 98 text before the cloud screen press F8

You should get a menu. Chose the "Comman Prompt Only" option and press enter.

At the C:\ prompt type FDISK and press enter
Chose option 4, write down this info and post here and we can further assist you. Just press ESC to exit out of FDISK