If you're still having issues with only seeing the edges of the polygons, then I suggest you do the following:
Visit nVidia's website at this link
here and download a set of drivers older than the ones you have now. Once you have the drivers, click Start, Settings, and then Control Panel -or- Start, then Control Panel. Once you have the Control Panel open, go to Add/Remove programs and uninstall your current drivers by removing them from the list.
Once that is finished, reboot your PC and install the drivers you just downloaded. Reboot your PC when prompted, and then open up your Display settings (as mentioned above) and turn off all your extra graphics options.
Keep doing that until you find a set of drivers that works. That's all I can suggest for the nVidia card issue.