Thanks. Tried to run the command line and got Sysprep was not able to validate your Windows installation.
Log file shows
2014-01-08 16:36:10, Info SYSPRP ========================================================
2014-01-08 16:36:10, Info SYSPRP === Beginning of a new sysprep run ===
2014-01-08 16:36:10, Info SYSPRP ========================================================
2014-01-08 16:36:10, Info [0x0f004d] SYSPRP The time is now 2014-01-08 16:36:10
2014-01-08 16:36:10, Info [0x0f004e] SYSPRP Initialized SysPrep log at C:\WINDOWS\System32\Sysprep\Panther
2014-01-08 16:36:10, Info [0x0f0054] SYSPRP ValidateUser:User has required privileges to sysprep machine
2014-01-08 16:36:10, Info [0x0f007e] SYSPRP FCreateTagFile:Tag file C:\WINDOWS\System32\Sysprep\Sysprep_succeeded.tag does not already exist, no need to delete anything
2014-01-08 16:36:10, Warning SYSPRP WinMain: File operations pending
2014-01-08 16:36:10, Info [0x0f003d] SYSPRP WinMain

isplaying dialog box for user to choose sysprep mode...
2014-01-08 16:37:25, Info [0x0f00d7] SYSPRP WinMain

re-validing 'cleanup' internal providers.
2014-01-08 16:37:25, Info SYSPRP RunExternalDlls:Running platform actions specified in action file for phase 3
2014-01-08 16:37:25, Info [0x0f00ba] SYSPRP SysprepSession::CreateSession: Successfully created instance with mount path C:, action file C:\Windows\System32\Sysprep\ActionFiles\Cleanup.xml, and mode <null>
2014-01-08 16:37:25, Info SYSPRP SysprepSession::Validate: Beginning action execution from C:\Windows\System32\Sysprep\ActionFiles\Cleanup.xml
2014-01-08 16:37:25, Info SYSPRP ActionPlatform::GetStringValue: Getting REG_SZ value SysprepMode under key HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Setup\Sysprep
2014-01-08 16:37:25, Info SYSPRP ActionPlatform::GetValue: Getting value SysprepMode under key HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Setup\Sysprep
2014-01-08 16:37:25, Warning SYSPRP ActionPlatform::GetValue: Error from RegQueryValueEx on value SysprepMode under key HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Setup\Sysprep; dwRet = 0x2
2014-01-08 16:37:25, Info SYSPRP SysprepSession::CreateXPathForSelection: Sysprep mode in registry is <null>
2014-01-08 16:37:25, Info SYSPRP ActionPlatform::GetStringValue: Getting REG_SZ value PROCESSOR_ARCHITECTURE under key HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Environment
2014-01-08 16:37:25, Info SYSPRP ActionPlatform::GetValue: Getting value PROCESSOR_ARCHITECTURE under key HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Environment
2014-01-08 16:37:25, Info SYSPRP SysprepSession::CreateXPathForSelection: Processor architecture in registry is AMD64
2014-01-08 16:37:25, Info [0x0f0080] SYSPRP ActionPlatform::LaunchModule: Found 'Sysprep_Clean_Validate_Opk' in C:\Windows\System32\spopk.dll; executing it
2014-01-08 16:37:25, Error [0x0f0036] SYSPRP spopk.dll:: Sysprep will not run on an upgraded OS. You can only run Sysprep on a custom (clean) install version of Windows.
2014-01-08 16:37:25, Error [0x0f0082] SYSPRP ActionPlatform::LaunchModule: Failure occurred while executing 'Sysprep_Clean_Validate_Opk' from C:\Windows\System32\spopk.dll; dwRet = 0x139f
2014-01-08 16:37:25, Error SYSPRP SysprepSession::Validate: Error in validating actions from C:\Windows\System32\Sysprep\ActionFiles\Cleanup.xml; dwRet = 0x139f
2014-01-08 16:37:25, Error SYSPRP RunPlatformActions:Failed while validating SysprepSession actions; dwRet = 0x139f
2014-01-08 16:37:25, Error [0x0f0070] SYSPRP RunExternalDlls:An error occurred while running registry sysprep DLLs, halting sysprep execution. dwRet = 0x139f
2014-01-08 16:37:25, Error [0x0f00d8] SYSPRP WinMain:Hit failure while pre-validate sysprep cleanup internal providers; hr = 0x8007139f
Weird. Seems it says Error [0x0f0036] SYSPRP spopk.dll:: Sysprep will not run on an upgraded OS. You can only run Sysprep on a custom (clean) install version of Windows.
Oh well