I can't see in my Windows 7 how to change the monitor settings. I find the buttons but don't know how to move anywhere and don't actually see anything about scaling in the monitor menu.
The monitor controls for scaling
would be built into your monitor -- you push the buttons on the monitor and navigate through the popup menu. If I understand what you said earlier, your monitor has selections for "Aspect" and "Full" and doesn't mention "scaling." You'd choose "Aspect" to retain the aspect ratio of the game and not stretch it to a widescreen monitor. Video card settings for scaling
would be accessed through the video card's software. Sometimes Nvidia puts an icon in your taskbar so you can access the controls quickly, or sometimes a selection for Nvidia controls is in the right-click-on-the-desktop-where-there-is-no-icon menu. If you don't care whether your picture is horizontally stretched or not, you don't need to configure scaling settings
-- either on your video card or on your monitor.
I don't want to change my desktop screen resolution on the Windows 7 to 800x600 to even try it. I am afraid I will not be able to change it back.
The problem with reducing your desktop resolution is that if you have a lot of desktop icons, they'll get rearranged in order to fit. It's extremely unlikely that you wouldn't be able to restore your desktop resolution back to what it was, but putting your icons back the way you want them can be a nuisance.
It's looking like if I play for an hour or so then it starts to act up.
If the game is playing OK for an hour, there's probably not much you can do other than try different video drivers (probably older ones) and see if they are any more stable. Most tweaks suggested in this thread are for if the game won't start at all or crashes when you load a game.