How do you get wireless router to share Internet connection?

Just got a wireless card for my windows xp dell upstairs so it can get internet from wireless router downstairs. Dell says it is connected (signal stregth very good, it does say logged in as associate) but internet is not working on the dell. How can i fix it?
 
rtl8185 card downloaded them the other day....its talking to the network just not sharing the resources on the network