Have you tried another make/model card?
I have installed a wireless cnet card model cnwlc-811 and when it is plugged in it checks and blinks for a split second and then I get the Red exclamation with the error listed in the subject line. (cnet wireless lan card lost). How can I fix this problem. The router is fine on the other computers. I am a novice so anyhelp would be good and an 800 number would be good to call cnet also. thanks m