Couple reasons this may happen.
First check to see the windows time service is running.
Go to search and type services and open services.
Scroll to Windows Time and double click on it and set it to Automatic and Start it.
Then set your timezone to automatic.
http://www.thewindowsclub.com/set-time-zone-aut...
Try that and see if that helps.
If not it might be your system clock on your motherboard needs changing.