Wirless connection problem

Hello,
I have my wirless moden setup. I have wireless adapter connected to labtop I set configurations in my service page to Automatic then Start. my wirles icon show that is searching and picks up several connections including mine. on my connection it shows a little yellow lock. anyways it pck up signal (verystrong) and connects. But in a few seconds it disconnects I've have talked to my router tech services and linksys tech services. They say that something in my computer configurations is not letting me connect to wireless. please help.