Hello, This may seem like there's a really obvious answer to my question, but I am confused. Do I need to buy a wireless card for my acer 3620? If so, what one should I buy? Or is there already one?
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No, you do not need one, as it comes with a card. You'll have to go into the device manager to see if it is enabled or if it is even there. If you cannot see it, download the drivers for it via acer's support site.