Snow leopard seems to have disabled airport

just installed SL (19/11/09) and now my airport seems not to work. I am unable to connect wirelessly to my router. Help appreciated

Go Finder > Your HD > Library > Preferences > SystemConfiguration.
Move the SystemConfiguration folder to your Desktop.
Restart. Now, try airport. Try your network. Try your browser.
Keep your System Configuration folder for a while just in case. But, it should regenerate more or less right away.

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