Operating System: Windows Server 2008 (Note: might work with other versions of this os.)
C5150n C5200n Series GDI Driver for Windows 32 and 64 Bit Operating Systems
Install instructions: 1. Double click on C51200GDEA.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:OKIDATAC5150_C5200EnglishGDI.
6. Click OK