Open a command prompt with Run as Administrator and enter the following commands.
net stop w32time
w32tm /unregister
w32tm /register
net start w32time
net time /setsntp:0.us.pool.ntp.org,1.us.pool.ntp.org,2,us.pool.ntp.org,3.us.pool.ntp.org w32tm /config /syncfromflags:MANUAL /manualpeerlist:"0.us.pool.ntp.org,0x8 1.us.pool.ntp.org,0x8 2.us.pool.ntp.org,0x8 3.us.pool.ntp.org,0x8"
net stop w32time
net start w32time
w32tm /resync /rediscover