Yipe, wow... Just freaking great. When I get some time, I'll have to check into it and see if there is a way to do it.

If you are on an Active Directory Domain with your XP Pro box, you only need to have the domain controller set to synch with NTP, as the XP Pro box by default (when joined to AD) will fetch its time from the domain controller. (Or whatever they call domain controllers these days...)

But if you are standalone, hmmm...  You can go to http://www.boulder.nist.gov/timefreq/service/its.htm for freeware NTP clients for all versions of Windows.

I'll check into the new w32tm later, I'm at work right now.