1) Open an elevated command prompt
2) Run commands:
w32tm /config /syncfromflags:DOMHIER /update
w32tm /config /syncfromflags:domhier /update /reliable:yes
w32tm /resync /nowait
net stop w32time
net start w32time
You can check the time source and state using:
w32tm /query /source
w32tm /monitor
Yogesh 