Can't Join 2003 Domain After RC1 Update

Vista pre-RC1, I was joined to a domain with the domain controller running on
a 2003 server.

On running the RC1 update (build 5600) on my desktop, the LAN went dead. I
left the domain for the default WORKGROUP and my LAN returned.

However, on attempting to re-join the domain I get the message:

An attempt to resolve the DNS name of a DC in the domain being joined has
failed. Please verify this client is configured to reach a DNS server that
can resolve DNS names in the target domain.

I've disabled IPv6 (atleast I think I have!) and that didn't resolve the
issue.

Any ideas?

- sounds identical to:

http://windowshelp.microsoft.com/com...b6d&sloc=en-us