Nokiasiemens router not connecting

Sir,

I have bsnl broad band with nokia type 4 modem, the problem is when i connect wi-fi to my desk top through Belkin wireless adopter "N" in WPA-PSK mode its not locating the router but if i select network authentication OPEN its locating, please tell me step by step procedure how to connect my pc in WPA-PSK mode,

i hav gon through below link to configure my router.

To configure a secured WIFI. This link will help you.
http://blog.albinjey.com/2009/04/securedwifi/

Ram
mail id: ramakrishna7434@gmail.com