How do I get my wireless connection to work

I recently purchased a linksys wireless-N home router for my apartment. I went through the set up and started the network. 3 out of the 4 laptops in the apartment are successfully connecting to the network but my laptop does not seem to be connecting wirelessly. I have spent hours on the phone with linksys and still have no results. They told me that the connection is fine and there is something wrong with my computer and its wireless capabilities. However I have no problem getting onto other networks. What can I do to get my laptop hooked up to my network wirelessly?