Can't get Linksys Wireless Adapter to work

I have a Belkin N+ Wireless Router that works great with my new lap top (so i know the router shouldnt be the issue). I hooked up a Linksys Wireless Adaptor to my older desk top for my daughter to play with (i thought it would be easy). The adaptor was installed correctly but for some reason it is not picking up the signal from the router. I dont know if the settings are wrong or what. please help.

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