If you're using Windows Vista, you MUST download new the drivers from http://lexmark.com. Their installation CD that came with your printer does NOT have those drivers, although you won't see any reference to that fact.
Just run the file after it downloads and it will install itself with no problem. Be sure to reboot your system before expecting any positive results. Save the file to a CD and store it in a safe place where you can access it when needed.
Bob Wesley, July 2008