Wrt300n security issue. And Gaming issue.

I have wrt300n router, And when i try to add any of the Security Modes, i can't connect to the internet with my WMP54G. but when i Disable the security mode it connects just fine. So my question is how can i have my WPA2 personal Security mode up (or any security modes up)and connect with my wireless card ?? It connects just fine with my labtop, when the security mode is up, But the Pc downstairs with the Wireless card in it dosnt want to connect.. My pass key works and it connects to the router just fine, but it just dosn't want to allow me to access the internet. Oh and another thing when im playing Online games, As in Counterstike, The wireless connection seems to drop! The computer i game on is connected directly to the router. The wireless drops on the Pc downstairs and on my labtop.
Thanks 

Does it work on other security modes? WEP? WPA personal?
The box said windows xp or better... So I installed Linux!

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