Time on PC continues to be fast

I work in a small business office that runs on scheduled appointments. All of the clocks on our computers are consistently running fast, but not all at the same rate. We have a computer sign in system for our clients so that we can track our time precisely to be more efficient. This system is worthless if our clocks are not accurate. I have researched this and most say to just sync it with the internet, but that is not an option on our clock menu (only has two tabs). We had our tech take a look and he wrote a program, but it only works when the computer is rebooted. Then after a little time passes, the clocks are fast again. This is becoming a major problem! Can anyone help?!?
 
Go to Services
make sure each system has Windows Time enabled and Autostart
 
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