In Win '98 (assuming ME works the same?):
Right click anywhere on the desktop and select "Properties". Click the settings tab. Click "Advanced". Click the "Adapter" tab. There should be a setting for refresh rate. If not, or if you can't change it, look under the Nvidia or GeForce tab and look for an option like "Refresh Rate equals - Default, Predefined, Custom, or Optimal." Try Predefined or other values and see if this allows you to change it.
If none of these work, log on to
http://64.113.35.210/index.htm (
www.entechtaiwan.com and d/l multires.exe. It's 52k, freeware and a handy little TSR that let's you set resolution, refresh rate, and color depth from the systray.
Hope this helps!