It would be a far better solution all round to get your self an ADSL modem/router. They don't need drivers and are therefore Vista compatible straight away. They have the added advantage of using Ethernet connections rather than USB, which is notoriously unreliable and, as you've found out, impossible to get updated drivers for.
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Do you know that we're all in line for succession to the throne? Really?
Well, if forty-eight million, two hundred thousand, seven hundred and one people died I'd be Queen.