Intel 5100 wifi card showing up as a 3945 BG card

Hello,

I've updated my Sony Vaio VGN-TXN15p. After a fresh install of Win 7 pro and a new Intel 5100 Wifi card. The system only recognizes the new card as a Intel/Pro 3945 B/G card. I'm not able to find anything in the advance settings to get a "N" signal. I have uninstalled and looked for new hardware but it only recognizes the old wireless chip I had.

I've opened up my Router (R4500) to WWN and QOS as per the other forums state I should do, as well the newest firmware is up to date on the router.

What am I doing wrong here? Did I get a counterfeit 5100 wireless card?

Thanks,