Airport unable to connect - keeps getting unnecessary certificate

Wanted to bring my new Mac to school - and connect it to the wireless network. I can't get access because my mac keeps downloading a certificate which somehow prevents my computer from getting access to the wireless network.
I've asked both the guys who works with the wireless internet (and setting it up on regular PC's) and the guys working with mac's.. Nobody seems to know why my mac keeps downloading this certificate - but all agree on the fact that it's the reason why I can't connect - so how do I force my mac not to download this certificate - since it is not necessary for connecting to the network at all..
The man who knew most about mac suggested a re-install of Mac OS X - but this seems a quite drastic?
Hope somebody knows what kind of magic to use..
I'll of course try to get the most information possible if something is needed to solve the problem..

Strange. My school has something similar, but I can get through just fine.
When you get notified of the certificate, click on Show Certificate, then check the box to explicitly trust your school's certificate. Enter your password to confirm.
See if that helps.

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