10.5.3 - Erratic Airport connection since update on Mac Mini G4

Updated to 10.5.3 a couple of days ago. First it took ages to install and the system stalled on "writing installing script". Had to take a deep breath and restart.
All was fine with wireless until yesterday when all of a sudden it stopped working. Airport reception bars went from perfect reception to 1 bar. Modem not even blinking when I try to load a page and iPhone working perfectly over wireless, so it's not the modem. Error messages are erratic, telling me that I'm not connected to the internet. Trying to turn on and off Airport works erratically. It brings back reception completely for a minute of so, then down again. I sometimes get a "connection timeout" or an "incorrect application" or something like that.
Back to the old ethernet cable then, until Apple fixes the issue. Has anyone any idea? I also repaired permissions, no change. PRAM reset maybe?

Here are some screenshots:
*DNS settings:*
http://i36.tinypic.com/11mcly0.jpg
*Proxy settings:*
http://i33.tinypic.com/ekepec.jpg
They are in Swedish but you should be able to understand anyway. My brother does not even have Leopard installed so I couldn't compare it as easily but what I found there was no difference. Everything seems to be okay but it just wont work.
I also found that I can't use the Apple Updater anymore because it says that I am not connected to the internet.
Also when I did the network diagnostics it ended with saying that I should restart any units I might have, and I did that and then it told me if there were any more units I could restart and I said no and then it just said that it could not solve the problem.

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