It's possible that you installed drivers from the incompatible CD-ROM with Mac OS X 10.5 or greater.
Uninstall the drivers and try the driver reinstallation following the steps below:

NOTE: Illustration shown below is from a representative operating system and may differ from your operating system.

1. Click Apple Menu => System Preferences... (If you are using a USB cable, be sure to disconnect it.)
    
2. Click Print & Fax, Print & Scan or Printers & Scanners.
    
3. Delete the driver and close Print & Fax, Print & Scan or Printers & Scanners.
   
   
   

    

4. Go to the Downloads section of this web site and install the latest printer driver. The installation instructions are available in the Downloads section.