Did you install the nvdia drivers for the 6600? You should be able to get them on Nvidias website or from Microsoft. Your video experince will be much more enjoyable with the proper drivers.
The drivers from Nvidia or Microsoft should be 250 to 300 mb in size.
When you check in properties for the display does it say standard vga drivers or does is say 6600GT? Standard is windows drivers of a generic variety and if it has your model of graphics card listed then it has the correct drivers.
That card performs the best at 1280 by 1024, but should be able to display higher resolutions.
Yoiu can let Nvida detect the needed drivers and get them here:
http://www.geforce.com/drivers
and lastly hopefully you have enough cd's for a month or so.
The 6600 and such came today...it's installed and running from VGA at 1280 by.
I finally figured I don't want or need Trusted Platform Management and uninstalled it, and I actually have no device conflicts or missing thingies in Device Manager.
Once in a while it takes a while to shut down but I'm learning.
Now, if you'll excuse me I got me a loan until tomorrow and I'm not eating chicken NOR beans for dinner today, it's my burger and tots from the mom and pop place.