Add More Time Servers

As you may or may not know, Windows XP provides an easy and fast way to synchronize your system time with an Internet time server (Control Panel/Date and Time/Internet Time). By default there are only two servers available (time.windows.com and time.nist.gov). To add more, just add them in the registry (HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\DateTime\Servers).

More time servers can be found Here