Backtrack 5 Wifi not working

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http://www.backtrack-linux.org – I am relatively new to Linux and have been trying to use Backtrack 5 but it doesnt detect my wireless card so I cant connect to any wireless networks, I am using a Realtek RTL8191SE Wireless LAN 802.11n PCI-E NIC wireless card. I was wondering is there anything I can do like download drivers/patches etc. to make my internal wireless card work, or will I have to buy an external USB wifi adapter. Also I am booting via USB. (HowTos)