If have tried it all, drivers (i have the most recent), settings, parameters, but my 5100 AGN in my Sony VGN-NS21Z under Vista does not go faster than 54MPS, whereas any other (USB) wireless device works fine at higher speed connected to an n-router
enable security WPA2-PSK AES and enable QoS on your router configuration
and also it cannot be reach after small jar. wireless hardware gets lost...?(sony vgn-z11mn)
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