The built-in wireless for the Thinkpad T400 gave me endless issues on Vista.  Everything works perfectly for a while.  Then all of a sudden it doesn’t work, and worst of all…  nothing I do from the Vista network configuration windows can bring the wireless interface back up.  The ThinkVantage wireless tools don’t help either and frequently the applications won’t load at all.  When this happens, the only fix for me seems to be to reboot the machine.  There is a work-around…

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