Reg File for adding additional time servers...

Browse to : http://www.eecis.udel.edu/~mills/ntp/servers.htm for a list of public NTP servers.

Save your list as a text file with the extension .reg
Here's a sample:
------------------- cut here ------------------
Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\DateTime\Servers]
@="1"
"1"="time.windows.com"
"2"="time.nist.gov"
"3"="clock.isc.org"
"4"="timekeeper.isi.edu"
"5"="usno.pa-x.dec.com"
"6"="tock.usno.navy.mil"
"7"="tick.usno.navy.mil"
------------------- cut here ------------------

Then R-click the file and select "Merge"

WooHoo!