I was also checking the same problem out some days ago. I even installed the 175.xx, 280.xx and 285.xx drivers. Same thing. So the problem is not related to a version but maybe some data that the Nvidia drivers are not sending to the windows/gui/system. Tested a 6200, 8400, 9500 and gt400.
For the part about if it matters or not, basically nothing changes, except if you would like to see there the name of the video card. The system will work great as it would with or without that particular window showing the name of the video card.
The video card will run just fine, will perform excellent and you will not have any problem if it does not show there. the only bad thing I have seen is that the name is not shown there, but heck, I did not buy a video card just to make it appear in a window did I ^^. I want performance and seeing that you have that particular video card you are REALLY into performance.