Well, I believe the 32 bit nvoglv.dll will be used by Poser, since Poser is a 32 bit app. I've never seen the error in any other program, and not involving the 64 bit version.
I don't know - I of course, installed the 64 bit version of the Nvidia drivers, but it also includes the nvoglv32.dll file too, presumably for 32 bit apps.

Yes, I had to add Poser to the Nvidia Control Panel. There were no apps at all in the list, probably because I installed the graphics drivers before I installed anything else. If you install it later, after you've installed programs already, maybe then it sees them and adds them. Who knows, I also have all that Vista indexing and background searching stuff turned off.

As far as the driver goes, yes, that's the current driver version for the 8800 - the whole 8 series for that matter - 175.xx.19.  Quadro drivers would be different. The current Quadro 1700 driver for Vista 64 bit is 96.85:
www.nvidia.com/object/winvista_x64_96.85_2.html
The 169.96 driver is for 32 bit Vista:
www.nvidia.com/object/winvista_x86_169.96.html