C5100n GDI Driver for Windows Xp x64 Edition / Windows Server 2003 x64 Edition
Install instructions: 1. Double click on 5100GDXP64EA.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:OKIDATAC5100nEnglishWinXp64_Win2k364.
6. Click on OK
7. Follow the prompts to finish the driver installation.