Ok I did a bit more hunting with Google, and this might be the problem. It is to do with the Wireless Zero Configuration within windows:
http://www.overclockers.com/tips1164/
Quote:
t seems like I hit a nerve - if you have a WiFi PCMCIA card that drives you nuts as it connects/disconnects with annoying frequency, you're not alone! It's not particular to one brand but rather an endemic Windows XP/2000 issue. Readers alerted me to a few articles that are MUST reads if this is a problem for you.
Readers responded with a variety of fixes, although it seems as if the most likely culprit is the Windows Zero Configuration Service in Windows XP (more extensive Microsoft documentation HERE.) This service "configures the wireless network adapter to connect to an available wireless network" and provides automatic configuration for 802.11 adapters.
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Loads of links on the page with extra info - hope it helps
