Graphics settings problem. [View all]

Just a while ago I had a slip with my mouse, and somehow made my display start showing images as 'stretched' horizontally. It's not really bad, but obviously the image is out of proportion.
I am using a Windows 7 unit, displaying simultaneously on a 15 inch standard monitor, and via HDMI cable, my 61 inch Vizio TV. When I first connected the cable, between the computer and the TV, I followed the instructions and came up with a nice functional dual display, that allows me to position windows on either the big screen or the monitor, and the cursor will travel from one to the other, very much like setups I've dealt with at work. Since it suited me from the beginning, I never got into the options to change anything, except to get the display as large as feasible on the big screen for reading text.

In Control Panel settings, I have selected 1024 x 768 resolution, and under 'Multiple displays' I have 'Extend these displays'.

On Graphics Options I have 'Output To' set to 'Extend Desktop' with 'Digital Television + Monitor'
On Panel Fit Digital Television I have 'Scale Full Screen'. Any other setting here shrinks the desktop from 16-9 to 4-3 size on the screen, which is obviously not what I had before my miscue. These are the only choices I can find that use both screens, and allow the cursor to travel back and forth between both. I had it really nice before and wonder if there is another place that adjustments can be made that I'm not seeing. Thanks to any who can help.