If you can connect to other routers, then the wireless device is probably installed and you need to setup how it operates.
There is a manpage 'man wireless' for wireless-tools. These tools can help you monitor and setup your wireless connections. You will also need to match the settings by using the web-based interface for the linksys router.
Here is a webpage which goes through basic setup for Fedora Core and Linksys.
http://www.dotancohen.com/linksyssetup/index.php#Basic