Plug in the ethernet cable or cat5 into laptop. then go to the keyboard and click on the windows key. go to computer then with the right mouse botton click it. select manage. in the new menu. select manege devices. look for the wifi. remove it. refresh. it will remove it. reboot pc. it will reinstall new driver for the wifi. if it does not work. wifi card is busted. on my own experience it was the wifi card no good. good luck
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