You don't need drivers for a router. They are a seperate piece of equipment and operate independantly of your computer or it's operating system.
What kind of problems are you having? it's probably related to something else.
Perhaps you need to get drivers for your wireless adapter? if so, linksys uses prism2 chipsets, so you will need the Linux-ng-wlan drivers. Go here: http://www.linux-wlan.com/index.html
and you can find the drivers to get your wireless network card working.