Remote Desktop 6.0 error - Trying to remote into a Windows 7 machine from an XP machine

I have an XP machine and a Windows 7 machine, which we are trying to remote into from the XP machine. Both machines are connected to our network, but only the Win 7 machine is on our domain. When trying to remote into the Win 7 machine form the XP with Remote Desktop 6.0, I'm getting error message 0x80090330. I have verified with my network admin that the login credentials are correct and still will not connect.

The XP machine is currently on service pack 2. Can anything be done without having to update the service pack?

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