Solution for problem with refresh rate on nVidia cards under WinXP:

1.- install 3D STEREO DRIVER from nVidia
2.- in nVidia control panel select STEREO PROPERTIES
3.- click on ENABLED BY HOT KEY
4.- press STEREO & TEST button -> new page was displayed
5.- select ALWAYS USE STEREO REFRESH RATE and set refresh rate for every resolution /with use SAVE SETTING button/ and enjoy...

Matuus
http://www.mojweb.sk/mygeforcepage