Change windows xp’s time synchronization frequency how-to

Found the solution here: http://www.pcreview.co.uk/forums/windows-xp-windows-xp-change-time-synchronization-frequency-t325219.html

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time\TimeProviders\NtpClient
Default is set to 604800 (7 days, bloodily stupid value chosen by M$?)

Change to a smaller amount, for example, 86400 (1day) or even 3600 (1 hour) if the OS is running some time-sensitive stuff.

A system restart is required for the new setting to be in effect.