Hi,
I have had similar issues with many of the T41 laptops that we are using at a free clinic run by us since installing XP sp3 and also installing a DLINK DIR-655 router. Windows does report the error being an incompatible software driver for the wireless card and suggests I download the latest driver from Lenovo.
I have tried that and also updated the bios but continue to have the problem. Since this started at the same time for all the laptops, with the installation of the Wireless N router, I am thinking the problem is an incompatibility with the IBM hardware to that technology (Wireless N).
Hope this helps.
