Keep getting clock error

Error message: Your Computer's Clock is Potentially Incorrect - Tor has determined that your computer's clock may be set to 2541 seconds in the future compared to the source "DIRSERV:91.121.108.41:9001". If your clock is not correct, Tor will not be able to function. Please verify your computer displays the correct time.

Is there a fix for this? I regularly check my pc clock against a internet time server, but it still happens....

Trac:
Username: robdotcom71