If your computer is a member of a domain, your computer clock is *probably*
synchronized automatically by a network time server. If your computer is not
a member of a domain, you can synchronize your computer clock with an
Internet time server.
The Internet Time tab is not available if your computer is a member of a
domain.
Internet Time Feature Is Not Available When a Computer Is a Domain Member
http://support.microsoft.com/kb/289689
A client computer may not synchronize its time setting with the time setting
of the domain controller in Windows XP or in Windows Server 2003
http://support.microsoft.com/kb/842199
How to configure an authoritative time server in Windows XP
http://support.microsoft.com/kb/314054
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Hope this helps. Let us know.
Wes
MS-MVP Windows Shell/User
In