If you have Windows XP, you'll never have to worry about manually by setting the computer's clock again!
Just double-click on the little clock in the system, and it will take time and date of the Display Properties. Click on the Internet Time tab, and you'll see a button, you can use immediately to synchronize the clock, one of the Internet. Of course, you have to be online for this small trick to work.
Similarly, you can know that there is a box-screen, where it says "automatically synchronize the with an Internet time server." If you do not remove this box, you will not be able to do a manual synchronization, as described above. But this feature is enabled, you can not only can do oman little trick, but the computer will automatically update when the once a week - all himself.
Of course, you have to be online when it is time to synchronize the, with the aim of this work.
In any case, regardless of how it has been updated (manual or automatic), it is still a smart way to keep your computer clock at the right time.
