Addendum
W32Time actually uses SNTP, not NTP, so doesn't have all the bells and whistles. But if it's accurate enough for Kerberos (shut up now before you start (:= ) authentication, I think it'll be accurate enough to stop your CVS repository getting munged.
Peter
Shill For Hire
[link|http://www.kuro5hin.org|There is no K5 Cabal]