I just set them up per this forums sticky and rarely have any issue at all. Sorry to read it's not working for you.
I'm have a Linksys WRT120N wireless router that I'm having a heck of a time trying to establish a wireless internet connection with.
I was thinking of installing third-party firmware such as Tomato to see if that would make the process easier. Has anyone had any luck with installing Tomato, or any other open-source firmware, on a WRT120N wireless router?