A dedicated video card will not directly affect your renders, since rendering is done using the render engine software in the CPU, not in the graphics processor.

However, it may improve the general stability of Poser.

And I would also suggest you try this, if you have not already done so: change your Preview from OpenGL to SreeD. Your integrated graphics chipset is almost certainly not adequate for OpenGL previewing, and this may be causing these problems. Possibly.

"If I were a shadow, I know I wouldn't like to be half of what I should be."
Mr Otsuka, the old black tomcat in Kafka on the Shore (Haruki Murakami)