Have you tried going to Lexmark web site or search the internet for the driver
also if running XP you could see if windows has the driver this can be found in control panal (printers and faxes then choose add printer (on left hand side panel ) and then follow the intructions
Matty
January 2008
try downloading t divers for it from here
http://www.driverstock.com/Lexmark-Z515-driver-download/12-26-5552/index.html
just make sure you choose the right operating system ie windows xp, or 2000, and run the drivers (double click), it should be fine!