E6530 WiFi and network controller

Hi all,

I need your help. I have a dell E6530 laptop. I am using Windows 7 64 bit and installed all important updates. I have installed all the drivers available on dell for my service tag. But still I don't see any neywork adapter for WiFi i.e. I can't find or connect my laptop to any available WiFi network. And also after installing all available updates and drivers (from dell) on device manager network controller and broadcom usc w/swipe sensor devices are still marked yellow. What should I do? Please help

Thanking in anticipation