Check in device manager for the wireless card. Right click 'my computer' select 'properties' click the hardware tab and device manager, it should be listed as a network device. if it's listed update the drivers, it may just be disabled in windows. If it's listed as installed and working correctly in device manager it may be faulty.
you can also try running 'cmd' to lauch the command prompt and typing "ipconfig /all" this will show all available devices in your computer and their state.
Good luck.
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