Operating System: Windows Server 2008 (Note: might work with other versions of this os.)
C3400 Series GDI Driver for Windows
Install instructions: 1. Double click on C34GDIV8EA.exe.
2. Follow the on-screen prompts to extract the driver files
3. Launch Add Printer Wizard
4. When prompted for the Manufacturer and Model click on Have Disk
5. Browse to the following location: C:OKIDATAC3400English PCL.
6. Click on OK
7. Follow the prompts to finish the driver installation.