Alright, based on your info I figured out I could change the aspect ratio on my monitor to 4:3, so old games are good and scaled to the height of the monitor.
I also played around a bit more with the Nvidia control panel, and it doesn't seem to let me select one of the PC options. When I do so it automatically switches to an equivalent resolution under HD, SD. As a result it still does not provide the option under Adjust desktop size and position to chnage the aspect ratio there. It appears it needs to be a "PC" resolution for that.
Do you know why it is so determined to be an HDTV?
Not that it really matters, just wondering. It has been so long since I bought a monitor, I'm used to everything being done through the video card/windows settings.
Thanks for the help once again, Q.