Definitely make certain all your drivers are current and programs updated.  Presently, I have P7, P8, PoserPro and PoserPro 2010 installed on my computer.  Whatever issues I had with P8 were corrected with the Service Releases.  I rarely experience creashes and when I do, they are largely my fault. 

As a word of advice, if you start experiencing unexpected problems down the road, always suspect an OS upgrade or application upgrade first.  Too often, users dismiss a simple security updates and find that Poser suddenly and unexplainably crashes.  Consider those problems when troubleshooting.