I am trying to set up a wireless home networking using a wireless aircard. I have installed the wireless air card via USB connect on my desktop PC. I have a Linksys Wireless router and I want to be able to connect two laptops wirelessly via this router. I am having problems establishing a connection. Need help

Have you set up the network name and whatnot through the router's configuration page? Start here, go to 192.168.0.1 in your browser window, the username and password should be nothing for username and admin for password. If these don't work, Google the router's Model # and "admin password" to find the proper ones for your router. Once into the router's settings, add a name for the network.
Then, under My Network Places on one of the computers, choose "Set up a Network for Home or Office" and walk through the steps, using the name of the network that you just created. If you get stuck, reply here and we can move from there.