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The error message I get is the windows prompt, the one with the foggy white background, and it says "Poser Pro executable file has stopped working. Something has caused the program to stop working correctly. Windows will close the program and will notify you if a solution is available."

Since you have an nvidia video card, after you get that foggy background thing (has happened to me many times in the past), click on "Details" on the error message. You should see the word "appcrash" and should see "nvogl32.dll" as the culprit. That's the Nvidia OpenGL driver file which is causing the problem. Or, more specifically, the file that Poser doesn't know how to deal with even though most other OpenGL 3D programs can.

That's the kind of information you need to find after an app crashes, and that Details button has a world of useful informattion under it.

But yeah, pretty much what everyone else said above regarding this - try that and if it doesn't solve your problem, come back with more details. I've forced PPro to play nice on my computers and I know a few tricks to force it to comply.

Note, if it does work in SreeD,  while that will indicate an OpenGL problem, you don't have to deal with SreeD - it can be made to work in OpenGL.

The reason I mentioned the hard drive is because I was having several programs crashing unexpectedly a while back andf I couldn't figure out why. Turned out the common denominator was that they all crashed when trying to access files form my drive which had most of my 3D content on it - models and textures and other propritary files. So I finally thought to check the drive for boot up speed and other things and found out it was failing and had bad sectors. I managed to copy alot of it to another drive, but kept getting BSOD'd at certain points during that. So it was the bad drive causing crashes and hangs. Same thinh with a RAM module which went bad in another case - WIndows reported my memory was fine but I would get crashes after about 4 GB was used up. I tried Si-Soft Sandra and it reported all was well too, so I tried this free DOS program called "Memtest" which runs before Windows loads and discovered a bad RAM module. Replaced that and memory related crashes went away.

Poser Pro out-of-the-box isn't the most stable program around for alot of people, but it CAN be made more stable with certain tweaks, mostly in the OGL department.
And as Teyon said, be real careful when messing about with the drivers.