[ubuntu] Wireless just stopped working Ubuntu 10.10

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http://ubuntuforums.org – I just installed Ubuntu 10.10 two days ago. I have a dell Studio XPS 1645. I changed my internet to WPA2 yesterday, and it connected and worked fine. I turned it off and when I turned it back on today it finds the connection, does the connecting thing (where the picture goes around) then says it is disconnected as if I lost connection. HELP please I don't want to be forced to use windows and need to configure ubuntu still (I want to download a lot of stuff still + I need internet anyways). (HowTos)