ZSoft TimeSync is a very simple software that synchronises you computer clock via the Internet.
All you have to do is run the program at you will be prompted with a message box either saying ":o)" (means that it properly worked) or ":o(" if it didn't. This got to be one of the most multilanguage programs in existents ;o).
And oh, a feature that I haven't described before is the one enabling you, as the user, to change the server to get the time from, by running TimeSync with a parameter - your server of choice. The default timeserver is time.nist.gov.