I've tried Vue-4 on 2 XP machines with basically the same hardware & video card, and with XP home and pro editions. It works a treat on one machine, with all OPENGL opetions enabled. On the other machine it dies horribly whenever I have OpenGL selected. both machines have Nvidia Geforce cards with the same drivers. Its a puzzler as to why it works fine on one machine and not the other, when they are essentially the same. Oh, by the way, don't believe what you hear about apps not locking-up the machine in XP. If its a low level driver crash, such as OpenGL, then it will kill any XP machine, so only a hard-reset will get it back.