Iomega portable hard drives connect to your computer through a USB port. When you connect the Iomega hard drive to your computer, it should pop up as an icon in your My Computer folder. If you can't find the icon in your My Computer folder then you probably need to update the driver for the device. Updating this driver is not very hard and can be done automatically from the Windows Device Manager.
Plug your Iomega hard drive into one of your computer's USB port.
Click the "Start" button and go to the "Run" field. Type "Devmgmt.msc" into the Run box and press the "Enter" key.
Go down to the bottom of the device manager to the "Universal Serial Bus Controller."
Click on the little + (plus) sign to expand it. Look for an entry with a yellow exclamation mark and click on it. Click the "Install the software automatically (Recommended)" button and then click the "Next" button.
Click the "Finish" button when the installation has finished. Go to the "My Computer" folder from your "Start" menu and locate the Iomega hard drive icon. Double click the icon to gain access to the external hard drive.