With this tweak you can disable the Windows Time Service.

To do this, follow  the next steps:

1. Open the Registry Editor click on the Start button on your taskbar, then click on Run and type "regedit" and click on OK to start the regedit utility.
    
2. Expand HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time (see picture 1).
   
   

   Picture 1

3. Create a new DWORD value called "Start", or modify the existing value, to "4".
    
4. The modifications you made will be in effect after you reboot your PC.