[ubuntu] Connecting to internet messes up everything

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http://ubuntuforums.org – When connecting to my wireless, I can no longer use any programs. I can not even restart the PC. I can only connect to the internet. I cannot get on it at all or use any program/application. It is like connecting to the internet locks everything from running. Is there a way to fix? If I disconnect everything is working fine. When installing Ubuntu I got this message: "Attempting to find an available wireless network failed." But my internet is up and running. It ask for a WEP key but my network is on WAP (HowTos)