NTP sync on Windows Server 2008

How would you make a Windows Server 2008 server sync with free ntp servers on the Internet?

What free programs would do this?
How do you configure them? (I need it to sync every 30sec as the server's clock drifts very very fast ~1sec per 40min)

Update: See follow up question

Answer

You do not need any outside software, just use this document to show you how to configure it natively:

http://support.microsoft.com/kb/816042 (read the section "Configuring the Windows Time service to use an external time source")

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