The resolution or display is wrong and I cannot put it back to what it was.
I had tested a couple of monitors with my notebook/laptop computer to see which monitor works and which monitor does not work. Now, the resolution and proportion display on the laptop's monitor is wrong. I cannot fix it. I have looked in the Control Panel and the couple of help links but nothing will allow me to put back or change the display settings or resolution. The machine seems to be stuck with low resolution of I'm guessing 640 by 480, and the desktop image appears stretched horizontally. The laptop monitor is diagonally about 17 inches.
How can I fix this? I do not remember the exact resolution that the computer display should have but I know it must be greater than what it is showing. I do not know why the settings seem not changeable, or how to find and decide what to change/how to change.