Hi, what is the Model number of your drive? I assume it is a USB drive - is your computer USB2 compatible, because I suspect the drive is USB2, which I don't think is backward compatible to USB1.
To find out if your pc is USB2 compatible ... Right-click on My Computer and then Left-click on Properties, then on Hardware then on Device Manager, then Left-click on the + beside Universal Serial Bus controllers - if you then see the word Enhanced anywhere within that section, then your PC is USB2 compatible. You can then just close all the small windows that you just opened.
That will give us somewhere to start, to try to help you.