lexmark printer problem under CUPS

hi
i am trying to install printer (lexmark z12) first of all i run "sudo cupsd" to run CUPS. after that i started printing manager and click on add a printer. I found the printer lexmark Z12 but when i select it and click next, it says "unable to load driver...wither driver doesnot exist or you do not have permission to access it"

please help me what to do now?i am working on live CD knoopix ver 3.3 and loged on as root. how can i install driver if it doesnt exist? would i need to do remastering??