I found this in a few different places around the 'net - hopefully it's helpful:
Synchronize Your Computer Clock with an Internet Time Server
Does your computer have the right time? If your computer is not part of a domain, you can synchronize your computer clock with an Internet time server. To do so:
- Double-click the time on your task bar.
- Click the Internet Time tab.
- Select the time server you want to use and make sure to select the Automatically synchronize with an Internet time
server check box.