I was just wondering why my wireless networking card, a BCM4318 [AirForce One 54g] 802.11g Wireless LAN Controller, works perfect off the Live CD of BT5 but after I install it doesn't even recognize that the card is there?

I am forum hunting for a way to get it going again but was just curious as to why my fresh install couldn't even see my wireless card where the live cd used my card to crack a wep wireless signal.