MacBook Pro Can't connect to WPA protected network

Just got my new MBP this week. I am in love with it but I have this problem, I can't connect to WPA network, every time I try to connect and type the WPA password it take time and then comes back with "There was an error joining the AirPort network "Intersys"
I removed the WPA from the router and try to connect and it work fine. Change to WPA and no connections.
any suggestions? Thanks in advance

I was actually logging into the forums for this exact reason.
I bought a new router ( Linksys http://tinyurl.com/fkrt9 )last night and wanted to set up WPA/WPA2 encryption on it.
My choices after that we AES and TKIP. I know more about AES so I selected that and set up my key.
Well after that I got the same error that you got. SO I went back and selected TKIP instead and I've been able to conenct, I'm also using 64 character key.
I would still like to use AES, but for now I'm happy with TKIP.
For more info:
TKIP http://en.wikipedia.org/wiki/TKIP
WPA http://en.wikipedia.org/wiki/Wi-FiProtectedAccess
MBP Mac OS X (10.4.4)

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