Linksys Wireless B multi wireless connection problem

I have a Wireless B router from linksys...whenever i try connected two
laptops to the router at the same time one of them doesn't connect. I
have two computers plugged in using an ethernet chord to the router
with the other two ports free.

I also have a ps3. When i connect to the internet using the ps3 on a
wireless connection it is able to connect and so is one of the
laptops. How can the ps3 and the laptop connect and not the two
laptops. I've tried setting up a new network, but no luck, it just
won't let me have 2 laptops going at the same time. Help please?