You don't need a separate program if you're running Windows - right-click on the clock/date at the bottom right of the screen, select Adjust Date/Time, click the Internet Time tab, and enable the check box. It will automatically resynchronise once a week, or whenever you press the Update Now button.
ok aquariel, the point is, I have to keep resetting using the method you suggest quite often, maybe 3 or 4 times an hour. I had an automatic time reset prog running before I had to reload windows after a crash...darned if I can remember what it was called!