Trying to Setup a wireless network at this office.

Hi you all… I’m having difficulties setting up this Network connection through my linkys router. Please HELP!!

There’s a Network setup in this building and in the office downstairs they bought 3 new laptops and 2 desktops… So i had a Lynkis router that i set up and one desktop and 3 laptops work just fine, but the other laptop cant see neiter one of them and can’t print as well, but before i set the router up it was printing just fine… so i guess there are 2 Networks and dont really know how to connect them… May be i should change some settings on the Router…
Please Help…
thanks!