XP never really selected the best connection right. You can try to set the metric of the ethernet adapter to be lower (higher priority) than the wireless adapter. this way it will try to use the LAN if its plugged in first, otherwise it will default to the wireless.
copied from micrsoft support (I don't have an XP machine nearby):
To change the interface metric, follow these steps:
1. Click Start, click Run, type ncpa.cpl , and then click OK.
The available connections appear in the LAN and High-Speed Internet section of the Network Connections window.
2. Right-click the network adapter that you want to change, click Properties, and then click the General tab.
3. In the This connection uses the following items box, select Internet Protocol (TCP/IP). Then, click Properties.
4. In the Internet Protocol (TCP/IP) Properties dialog box, click the General tab, and then click Advanced.
5. On the IP Settings tab, click to clear the Automatic metric check box. Then, type a value in the Interface metric box.
Do this for the both the LAN adapter and then the Wireless adapter. I put a 1 in for the metric on the LAN adapter and usually a 5 on the wireless adapter. You choose each adapter in step 2.
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Mokli - Druid of Karana
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