Operating System: Windows XP x64 (Note: might work with other versions of this os.)
ES3640eMFP PCL Driver for Windows XP 64 Bit - Windows Server 2003 64 Bit
Install instructions: 1. Double click on ES3640PCL64LSA.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:OKIDATAES3640eMFPPCLSpanishWinXP64_Win2k364.
6. Click OK