More information would be helpful. Windows XP did not support the WPA2 wireless encryption suite until SP3, so if you don't have SP3 installed and are trying to authenticate on a WPA2-protected network, it may not work.
Assuming you do have SP3 installed, try going into your wireless network configuration / setup screen. (There are several different wireless configurations, including ZeroConfig, but we don't know which one you're using). Most all of them save previous wireless
connections in a "profile" so that when it encounters that wireless connection again, it knows how to configure itself. Find the profile section of your configuration screen, look for the SSID of the router you are trying to connect to, and if you see it,
then delelete that profile. This will then allow your machine to reconnect to the wireless router with an open mind.
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