Did you try the basics?
ifconfig wlan0 up

First thing I would do is search the forums, since this is a subject that's been beaten into the ground.
But in an effort to help:
Post the output of the following command :
lspci | grep Network...

Hello,
I've recently downloaded the latest version, and I must say I'm impressed! I've successfully broken through my WPA router (changed pass to a dictionary word though, only way I was sure it...