The following will remove the partitions and "ALL DATA/Programs" on the drive. If you want anything on the drive, copy it or back it up someway first. The program to reset the HD is FDISK. The best way to do this is with a boot disk from a Win98 computer. You boot up with the bootdisk in the floppy drive. Make sure you have access to the CD and that it reads before proceeding. The Win98 bootdisk creates a temporary artificial drive so if the CD was E:\ , now it will be F:\. If everything checks out, when you get to the A:\ prompt, type Fdisk. The first thing asked is if you want large disk support-type YES. When you get the next screen, pick #3 and hit enter. On the next page, pick #3 (Delet Logical Drive in Extended Dos Partition) again and hit enter. When done, use ESC key to go back to the previous page. This time pick #2 (Delete Extended Dos Partition) and hit enter and again ESC back to the previous page. Next pick #1 (Delete Primary Dos Partition) and hit enter and ESC a couple of times to get back to the A:\ prompt. Reboot the computer with the bootdisk and again go back to FDISK and say YES again and at the main page, pick #1 and #1 again to Create a Primary Dos Partition. Just follow the instructions and pick 100% to make the entire drive 1 partition.
You will then need to ESC back out, reboot, and this time from the A:\ prompt type Format D

if that is the drive letter of the old drive). You must be absolutly positive about the drive letter as a slip up at this point can cause total loss of everything on you main hard drive if you are not careful. When you are done formating the drive, you should be able to see it from My Computer and in Windows Explorer. It is now ready to use. If you run into problem or have further question, post back.