How come i can see wireless networks but my laptop wont connect?

i can see wirelss networks on my gateway laptop vista is my operating system but when i try n connnect it says cannot connect but i run the diagnose problem n it says their is no problem? any suggestions?
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More about wireless networks laptop wont connect
  1. have you updated your wireless network card?
  2. Is the wireless card in the laptop configured correctly? Enter any encryption keys? MAC address filtering? Enable the correct signal type, b/g or n?
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Laptops Wireless Connection Windows Vista