To renew your IP address type the following at a DOS prompt: ipconfig /renew.
First try Gavin's suggestions, but I would even go further and turn off your broadband modem as well (provided that they have broadband). XP is usually good at picking up IP addresses as I have been able to switch between routers on the same computer without issue.
If all else fails, you can try reinstalling the network components in XP to see if that fixes the problem.
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