[ubuntu] Wireless connection not working (any more)

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http://ubuntuforums.org – Hey guys, my wireless connection is going nuts at the moment. I'm using two sony vaio laptops which are both giving me troubles connecting to wi-fi. That is, they connected fine just a week ago and more or less "suddenly" both lost connection and are now unable to connect to my network. Weird part is, I can still connect to other wi-fi signals and one of the Vaios works perfect with an installed version of Windows 7. Tried a library network today which didn't work, either, but at least found out that apparently my account wasn't even trying to connect to the servers (altough Ubuntu s (Hardware)