I have a Gateway 710X running Windows XP Home Edition which is several years old (Version 2002 purchased in 2004). I've purchased two different external hard drives that I've connected by USB cable. When connected to my desk top, the external hard drive icon does not appear on the list of hardware shown in My Computer. I can tell that the device is connected because I hear the connection beep. I've tried the current external hard drive on a laptop downstairs and the icon shows up. Any suggestion on how to access this device on my desk top?