[ubuntu] Can't set up Wireless

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http://ubuntuforums.org – I'm having issues setting up Wireless for Ubuntu 12.04. I have my wireless card plugged in and from my knowledge, Ubuntu can read it, but, I can't enable wireless. Whenever I try and turn off Airplane Mode or when I'm in the menu for Networking at the top of the screen and click "Enable Wireless", my computer freezes. Anyone know what may be causing this issue? It was working fine when I first installed ubuntu about an hour ago but now, it just doesn't work. Any suggestions? (Hardware)