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 or Print & Scan.
   
   
3. Delete the driver and close Print & Fax or Print & Scan.
   
   
   
   
   
   
   
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.
   
   
   
   • Click here to go to the Driver Downloads section for Mac OS X 10.5
     
     
   • Click here to go to the Driver Downloads section for Mac OS X 10.6
     
     
   • Click here to go to the Driver Downloads section for Mac OS X 10.7
     
     
   • Click here to go to the Driver Downloads section for OS X 10.8