Suddenly can't wirelessly connect with my Inspiron E1405
I am running a dual-boot with Kubuntu Dapper. At first I had absolutely no problem connecting to the internet wirelessly on either the Windows or Linux side. Now, I can't seem to connect with Linux - I can still see the available networks, but each time I try to connect, it just says "connection failed". I have tried on several networks, both encrypted and unencrypted, and none of them work. I have had no problem connecting on the Windows side. Any suggestions? I'm sorry if this is in any way vague, I'm quite new to Linux - please tell me if I need to provide any more info.