Hi,
Have you checked the time/Date settings to make sure they are correct?
If after you set the correct Date/Time in Windows and shut down then restart your machine the date/time reverts back to say the year 2012/2014 etc, you have a failed CMOS Battery in the Motherboard.
They cost about $5 and are easy to replace.
How to replace a CMOS Battery.
http://www.computerhope.com/issues/ch000239.htm
Cheers.