I've used Bob-Cad since 1996 and great success with their software up to V20. I bought V23 and felt the software went backwards, but the real problem is it will not install correctly on my computers, (my old XP, wife's laptop or my new HP both with Windows 7). Yesterday the same old problem cropped up as it has each time on the other computers, double click a CAD file and I get 'Bad Command' error and it won't load. Has anyone run into these problems and can anyone give me a direction to fix the problem. Thanks!!!