To deploy a Windows instant-clone desktop pool, you must first prepare a golden image virtual machine in vCenter Server. What to read next Configure a Windows Golden Image Virtual MachineAfter creating a virtual machine that you plan to use as a golden image, configure the Windows environment. Activating Windows on Instant ClonesTo make sure that Windows is properly activated when the clones are created, you must use Microsoft volume activation on the golden image virtual machine before creating an instant-clone desktop. The volume-activation technology requires a volume license key. Deactivate Windows Hibernation in the Golden ImageThe Windows hibernation feature creates a hidden system file, Hiberfil.sys and uses this file to store information that is needed for hybrid sleep. Deactivating hibernation reduces the size of an instant clone's virtual disk. Choosing ClonePrep or Sysprep for Customizing Your Windows Virtual DesktopsThere are two options for customizing instant-clone Windows virtual machines: VMware ClonePrep or Microsoft Sysprep. Creating Customization Specifications When Using Sysprep for Desktop CustomizationWhen you customize a clone using Sysprep, you need to provide a customization specification. Increase the Timeout Limit for ClonePrep Customization Scripts on a Windows MachineClonePrep post-synchronization or power-off scripts have a timeout limit of 20 seconds. You can increase this limit by changing the ExecScriptTimeout Windows registry value on the golden image virtual machine. Compute Profiles and Windows Golden ImagesThe VMware Horizon 8 compute profile feature significantly improves golden image management and reduces the number of golden images required to create desktop pools for different requirements. Parent topic: Creating and Preparing a Windows Virtual Machine for Cloning