"bcdedit.exe" is called internally.
BCDEdit /set
http://msdn.microsoft.com/en-us/library/windows/hardware/ff542202(v=vs.85).aspx (http://msdn.microsoft.com/en-us/library/windows/hardware/ff542202(v=vs.85).aspx)
If yes is set to useplatformclock, HPET will be used compulsorily.
It will not function, if there is no HPET in hardware.
Use of HPET is deprecated after Windows7.