Based on the tags from this post, it seems like you're trying to connect on the 5GHz band, which the internal adapter does not support (it only does 2.4GHz). And if you're only getting 802.11g on the 2.4GHz band, you want to make sure the wireless mode
is set to 802.11n only or 802.11n mixed mode, with the wireless security set to wpa2 or turned off.
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