IBM Thinkpad T40 Cisco Wireless Connection Problem

Hello,
I have my Notebook IBM T40, and when I want to connect to internet, it do it but only when the wireless signal is with out security (no secure) , when I put security in the wireless, it's doesn't work.. Can you guys help me please? I have a Linksys router and I don't have problems with another laptops..

Thank you!
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More about thinkpad cisco wireless connection problem
  1. Get an external WiFi card, T40s are not too good with the built-in wireless with newer standards. Have some at work, almost every single one needed to have a new wireless card installed.
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