Hi,
I understand that the computer keeps changing the date and time.
- Do you get any error message or error code?
- What is the make and model of the computer?
I suggest you to restart the following service and check if it helps.
Method 1:
**a.**Click Start, type services.msc and hit ENTER.
b. Locate Windows Time.
c. Right-click and select Restart.
**d.**Double click on Windows time and select the startup type as “automatic”.
Method 2:
Check and make sure that the date and time are correctly set in BIOS (Basic Input Output System). If he not comfortable with changing the date and time in bios, you can contact the computer manufacturer for changing that.
**Important:**Modifying BIOS/complementary metal oxide semiconductor (CMOS) settings incorrectly can cause serious problems that may prevent your computer from booting properly. Microsoft cannot guarantee that any problems resulting from the configuring of BIOS/CMOS settings can be solved. Modifications of the settings are at your own risk.
Method 3:
Automatically diagnose and repair problems with broken or not working desktop shortcuts and synchronize the system clock when a wrong time is displayed
Fix broken desktop shortcuts and common system maintenance tasks
http://support.microsoft.com/mats/system\_maintenance\_for\_windows/
Method 4:
If the issue persists, I suggest you to replace the CMOS battery and check if it helps. You can contact the computer manufacturer to replace the CMOS battery.
The CMOS battery and the clock chip on the motherboard must keep the clock running to maintain the record of the current date and time. If either of them has failed the time will not be correct on the next startup and the time will revert to the initial BIOS default.
Additionally, I’d suggest you to access the following TechNet link and refer to Nick FV's response posted on Monday, May 25, 2009 at 10:39 PM and check if that helps in fixing the issue:
Additional Information:
Set the clock
http://windows.microsoft.com/en-ca/windows/set-clock#1TC=windows-7
Change the display of dates, times, currency, and measurements
Hope it helps. Please revert if you face any issues related to Windows and we will be happy to help you.