If you are trying to SysPrep a Windows 10 PC and see: Sysprep Failure Unable to Validate Windows Installation and then see in the log: [0x0f0070] SYSPRP RunExternalDlls:An error occurred while running registry sysprep DLLs, halting sysprep execution. dwRet = 0x3cf2 You likely have some Win10 apps that are installed per person. Things like the calculator and paint may be installed by default but they are installed per person and not allowed to be sysprepped. …
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