Yeah, there's lots of hacks out there.  Here's a link to a utility I use
http://members.cox.net/klee15
Or try this:
http://ed.mullen.home.comcast.net/utility.html
Windows XP's clock can automatically synchronize itself to an Internet time
server. Double-click the clock in the System Tray, click the "Internet Time"
tab, check the box "Automatically synchronize with an Internet time server."

The default interval is 7 days, however there are ways to change that.

If you're unsure of how to use regedit ... DO NOT PROCEED!

To change the interval that Windows XP updates the time using the Internet
time servers via regedit, navigate to:

1. HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services
\W32Time\TimeProviders\NtpClient

2. Select "SpecialPollInterval"

3. Change decimal value from 604800 to a different value in seconds. i.e.:
172800 (2 Days) or 86400 (1 Day) and so on.

If you don't like manually editing your registry, you can use
this script

-----Original Message-----
From: For blind ham radio operators [mailto:[log in to unmask]]
On Behalf Of Walt Smith
Sent: Sunday, December 10, 2006 6:58 PM
To: [log in to unmask]
Subject: More on automatically synchronizing the clock


I just managed to hack the registry to add a time server with open access
that's _much_ closer to my QTH here in Clearwater. I had been using
time.windows.com (one of the three default choices presented in the Internet

Time tab list of time servers) and when I Pinged it, all requests actually
timed out; when I Pinged the new one (rolex.usg.edu at the University of
Georgia), the turnaround averaged 22 ms.