We would need to know the make and model of the wireless card or if its built in, the make and model of the computer in question.
Without that information the most we can do is suggest you find the correct drivers for the wireless card. Which you have apparently tried to do.
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Phil AKA Vacunita
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Ignorance is not necessarily Bliss, case in point:
Unknown has caused an Unknown Error on Unknown and must be shutdown to prevent damage to Unknown.