Macbook can not detect any keyboards or mouses

My macbook can't detect any keyboards or mouses on the USB-port. USB-sticks or disks are no problem.
A week ago there was no problem connecting everything. So today I used a USB-hub to connect my devices and mybe this was the problem.
After connecting, the mac can't decect any keyboards or mouses also without using the hub.
I tried:
restart
battery removal
PRAM reset
SMC reset
But always no result.
So what can help?
Tanks.

I believe it has to do with my Airport Utility on my MacBook (since the problem occers since I upgraded to the latest version). Is there any way to reinstall this App?
EDIT: Sorry, I believe I need to read this thread http://discussions.apple.com/thread.jspa?threadID=2644274&tstart=0
Message was edited by: Jaap74

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