Its easy. I had this problem. My Vista Ultimate X64 couldn't see my wifes XP Pro SP3. You need to get the hotfix from MS apply it too the SP3 machine. Reboot....once this has been done make sure both machines are on a static ip address.
To do this go to www.portforward.com following the guide on setting up an static IP.
Once this is done right click on my computer and make sure the workgroup names are the same.
That should jsut about do it.

let me know how you go.

Hazrd in vista go to Network and sharing centre. Make sure Password Protected sharing is OFF and make sure everything else is turned on. On the vista machine make sure that the network is a Private network.
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