Solve : External drive light on,but not in 'My computer'?

1.	Solve : External drive light on,but not in 'My computer'?
Answer» ???Doing my head in it is! I have an OLD Sony vaio which had Win98 installed at factory but I have purchased it with Win XP installed.I plugged in an external HARD drive and got message about SLOWER operating speed etc because device was USB 2.0 and laptop isn't.So I then bought a USB 2.0 card bus to convert my standard port to USB 2.0.Now when drive is used through card bus I get power and a green LIGHT but the drive is not recognised/displayed on the 'My Computer' page.Any clues anybody??Right clik on My Computer and SELECT disk management......does the drive show up in there ?

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