>>I have a graphic card which has three outputs. One goes into my 24" Acer monitor. The other one is HDMI and goes into a 42" TV downstairs. Both are setup for 1920x1080. This has worked before. However, I changed to Windows 7 today. Now, whenever the HDMI is plugged into the card, I cannot see anything. Basically, I only see the wallpaper. If i remove the HDMI, I see ok. What happened is that the desktop mode is presently in extended. I need to change that so it would know I have two seperate monitors. I just cannot find where to go in the display settings to adjust that.
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>I would try a control center/property tab for your video card.

Right-click on desktop / personalize/displaychange display settings

Your monitors should all be there with the Multiple displays options there. Some monitors specifics are down to the card i.e. sergey above