try the defuault password "admin" for the setup page. If that doesnt work, then try to reset the rtr for a min. But make a note that if u reset the rtr, all the old configuration will be lost from the rtr and then u will have reconfigure it
Linksys Setup CD said "Use Win XP or better" So i installed Linux
Well try resetting it for 30 secs in such a way that power light is blinking on the router & then do a complete network power cycle & then open the setup page of router using 192.168.1.1 & leave username blank & put the password as admin & it should work!!!