At a command prompt Type:

Net stop w32time
Net start w32time

w32tm /configure /manualpeerlist:pool.ntp.org,0x1 /syncfromflags:manual /update

Net stop w32time
Net start w32time

W32tm /resync

w32tm /monitor /computers:pool.ntp.org
w32tm /monitor /computers:pool.ntp.org