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Multiple Monitors

Problem: My laptop won't allow me to add a second display. Instead, this message pops up:

"The display control panel is unable to change the display settings. You may not have appropriate administrative rights to change these settings."

I close that:

"The display settings being saved are invalid. Please try a different combination of display settings."

When it started: The night previous, I had been using a second display (a tv) to watch DVD's via my laptop. I have been doing this for almost a year now. This morning, when I try to do the same thing, on the same tv, using the same methods, those messages pop up. Also, my primary, aka, my laptop monitor, is now listed as monitor number 2 (though it is still working, thank goodness). I think this is in conjunction with the problems.
I have not installed or uninstalled anything between when it worked and stopped working.

What I've done to fix it:I am the administer. I have checked, and double checked. I have logged out, logged back in, shut down, restart (with the tv plugged in and not) run anti-virals and spyware and used System Mechanic to find problems. It's all clean. I have checked my video driver to make sure it's working (NVIDIA GeForce Go 7600) and checked for updates.


OS: Windows XP

Experience: intermediate