I got a computer with Vista. Some people are lucky and can run Poser but not everyone has. Vista runs a lot of what's called middleware. That is new monitoring software processes that get between programs, drivers, and the hardware looking for authenticity. As such Vista does a lot of stuff programs were not written to handle and people do run into computability issues. So in a nut shell Poser was not written to run on Vista.

Another thing. The Vista default drivers for various Video cards are limited in OpenGL support and people can highly benefit from getting the manufactures most current drivers if that is possible with your Video card hardware arrangements.

Hopefully enoph of those who do have a lot of experience with tweaking Vista will respond to resolve the issue that your Poser has run into.  Good luck.

As for me I just removed Vista from the computer that it came on. 

My brain is just a toy box filled with weird things