I've seen a few threads where people are asking how to not stretch 4:3 games with their particular monitor. I found a low level solution I'd like to share, and it should work with any hardware with any game.
1. Download or buy the program PowerStrip.
2. In PowerStrip go to Display Profiles, Configure.
3. Choose the resolution you want to affect and click "Advanced timing options".
4. On the left half of the screen, modify the screen shape to be 4:3; click OK.
5. Set the resolution back to your normal desktop setting; click OK.
6. Keep PowerStrip open in the tray, and whenever a game runs with the resolution you affected, PowerStrip will override it and make it 4:3.
1. Download or buy the program PowerStrip.
2. In PowerStrip go to Display Profiles, Configure.
3. Choose the resolution you want to affect and click "Advanced timing options".
4. On the left half of the screen, modify the screen shape to be 4:3; click OK.
5. Set the resolution back to your normal desktop setting; click OK.
6. Keep PowerStrip open in the tray, and whenever a game runs with the resolution you affected, PowerStrip will override it and make it 4:3.