Hope Nistleboy's reply helped solve your problem. However it's a little cumbersome. And asking someone who has no idea what NTFS and FAT mean to open up the computer and unplug/plug hard drives may not be a good idea. Not to mention that some manufacturers may void warranty if the case is opened by non-authorized person. Here's an option without involving screwdrivers.
1. Click on Start menu then Run.
2. In the Run window that pops up, type cmd in the Open field. This should bring up Command prompt, a black window.
3. Type: format x: /fs:fat32 then Enter. (x is the drive letter of the portable hard drive shown in My Computer (XP) or Computer (Vista). Make sure you type the right letter to format the drive you wanted.)
4. You may then be asked the label of the drive. It's the name of the drive as shown in My Computer. Type as it appears in My Computer.
5. You will then see a warning message about all data on the drive will be lost and asked for confirmation. Type y for yes then Enter.
All done. You should see the format starting with percent completed progressing. It may take a while.
If you don't see Run option in Start menu, do the following:
1. Right click Start menu, then Properties.
2. On the Start Menu tab, click on Customize button.
3. Click on Advanced tab, and in the Start menu items: section, scroll down to the Run command option and check the box.
4. Click on OK to close all windows.
Click on Start menu now, and you should see the Run command.