The "conversion box for active stereo" you mention is called 60GX-NSR (Non Stereo Ready). Vizard on a GeForce card can supply the 60Hz "over/under" stereo format the NSR box takes and converts to 120Hz frame-sequential stereo format for display on the monitor.
For Vizard to generate the over/under image set the stereo mode to STEREO_VERT or INTERLACE_VERT.
Code:
viz.MainWindow.stereo(viz.STEREO_VERT)
Docs on the NuVision glasses and NSR box:
http://www.stereo3d.com/60gx.htm
The nVidea Glasses work with GeForce cards when the 3D software is using Microsoft Direct X for rendering. Vizard uses the alternative, OpenGL. So Geforce + nVidea Glasses + Vizard = not compatible out the box.