Macbooks lose wireless network connections when they go to sleep

I work off a Mac in a busy office. We have a password-protected wireless network. The password is saved on my computer. Our landlord has an unprotected network. When I boot up, my Macbook tells me that it "can't find" any of my "trusted networks" and asks me if I want to join my landlord's. I say, no, pick the password protected network from the airport menu and log on. When the computer goes to sleep (or I shut the lid to put it to sleep), upon waking up, it asks me the same question. Usually takes a few seconds to find the right network.
I have this problem in two offices with two wireless, password protected networks. One of the networks is brand new. My boss got a MacBook Pro running Snow Leopard and now he's having that problem on the brand new network, recently upgraded for future Electronic Medical Records applications.
Only his problem is worse because it won't remember the network password. He gets the "not connected to the internet message," runs network diagnostics, chooses the protected network, reenters password, finally connects to the Internet, then has to close the computer to run back to work. (Quite comical if you're not getting the heat for it.)
Note, neither of us have this problem in our homes where our computers run on Airport Extreme networks.
Is there anything we can do to ensure that the Macbooks always find the password protected network and we don't have to re-enter the network password every time?

Thank you very much for your answer. Now I admit I'm a total non-techie. I see how to choose networking from system preferences and change location from automatic to new network. Then I can manually add the network. But do I also have to 'set macs to remember previous networks' and if so, how do I do that?

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