said by richardg:

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On the Properties screen for your preferred network, go to the Authentication Tab and uncheck "Enable IEEE 802.1x authentication for this network". When you are using an Open or Shared (WEP) network, this option is not necessary and will result in the auto-disconnect problem every few minutes, if left enabled.

- Richard.

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Here are the symptoms of the problem: A Wi-Fi-enabled computer running Windows XP is working fine one minute, pulling up Web pages and processing e-mail. Then, for no reason, the connection drops, websites fail to come up and the e-mail flow stops. The small wireless connection icon in the taskbar says the signal from the access point is strong, so the problem isn't that the user wandered out of radio range. The icon even shows that the computer's Wi-Fi hardware is sending information to the access point -- it's just not getting anything back. And manual attempts to re-establish the connection through XP's built-in wireless configuration tool won't do the trick. Even more bizarre, the connection sometimes comes back on its own.

To some, the most infuriating part is that the wireless network connection icon in the XP taskbar doesn't display any indication at all that something's wrong. When there is a genuine hardware failure, the icon displays a small red X to indicate that the connection was lost. But with these mysterious disconnections, the icon continues to show a connection