I use CADKEY 19, and it is NOT just a 2D program, it is totally a 3D CAD system. I recently upgraded to Win7 and it works just fine. I did however, have to install it twice...Once in the native Win7 environment and also in the Virtual XP machine available under Win7. I only had to do the XP thing because my plotter is OLD (HP DesignJet 600), and there are no drivers available for Win7. Both environments work GREAT.