As far as I know this prob has been sorted out. However in the meantime check the article out below, that I found on a board:
NVRefreshTool is a utility used to fix the problem in Windows 2000/XP that sets your refresh rate to 60Hz when you play ANY game. This problem occurs whether or not you have a higher refresh rate set in your Display Properties of Windows.
What's New
Startup Feature added
Installer Program
Older Detonator Support
New and improved help file translated in 7 languages.
Direct3D-based Vsync testing tool
Code cleanup and UI changes
Custom Resolution/TVTool support
Debugging text file for better support
Download NVRefreshTool 1.0
http://www.nvrt.net/