WINDOWS 7 : SYSPREP 3.14 : A FATAL ERROR HAS OCCURRED DURING SYSPREP. 
01/29/20148 Comments
 
Firstly, run this command on command prompt  slmgr. vbs /dlv 

Then check the re-arm counter value, if it’s 0 and you sysprep you will receive errors in the setupact.log and setuperr.log files like these:

Error [0x0f00a8] SYSPRP WinMain: Hit failure while processing sysprep generalize providers; hr = 0xc004d307
Error [0x0f0073] SYSPRP RunExternalDlls:Not running DLLs; either the machine is in an invalid state or we couldn’t update the recorded state, dwRet = 31
Error [0x0f0082] SYSPRP LaunchDll: Failure occurred while executing ‘C:\Windows\System32\slc. dll, SLReArmWindows’, returned error code -1073425657
Error [0x0f0070] SYSPRP RunExternalDlls: An error occurred while running registry sysprep DLLs, halting sysprep execution. dwRet = -1073425657

Workaround: 

Open regedit and look for: 

HKEY_LOCAL_MACHINE\SYSTEM\Setup\Status\SysprepStatus\CleanupState

Set to value: 2

HKEY_LOCAL_MACHINE\SYSTEM\Setup\Status\SysprepStatus\GeneralizationState

Set to value: 7

And Run these command on elevated command prompt: 

msdtc -uninstall (wait a few seconds)

msdtc -install (wait a few seconds)

Reboot the system.

If this does not work, then last option is Windows Product Activation (WPA) vulnerability that was introduced in Windows 7

When the WPA registry key is deleted, the status of Windows 7 is re-initiated to the Initial Grace Period as if Windows 7 has just been installed. The deletion of the WPA registry key is achieved via the following method. 

·         Create a .bat file with following text and place it in C:, like C:\Reset.bat

reg load HKLM\MY_SYSTEM “%~dp0Windows\System32\config\system”
reg delete HKLM\MY_SYSTEM\WPA /f
reg unload HKLM\MY_SYSTEM

·         Restart the computer.

·         Press F8 right after the BIOS screen to get to the “Advanced Boot Options” and Select Repair Your Computer.

·         Select your keyboard input method, and click next.

·         Enter user name and password login credentials for local Admin user, and continue

·         In the “System Recovery Options”, open Command Prompt.

·         Run the Reset.bat file from C:

·         Restart the computer.

The system will be moved to grace period after the reboot.