My product doesn't appear in the EPSON TWAIN 3 Setup Port ID dialog box (Windows only). .

• Scanner must be turned on before computer. Make sure your system is correctly cabled and terminated and there are no conflicting SCSI IDs. Go to Control Panels, System, Device Manger. Double-click the Unknown Devices icon. Select Perfection 636 and remove it from the system. Restart your computer. with scanner turned on before computer.Then reinstall the scanner software.