How to change the screen contrast on vista?

I tried installing something and it said it couldnt responed and my screen just went bright.. i tried lowering the brightness but it wouldnt workHow to change the screen contrast on vista?
What type of monitor do u have. it matters on that too i have a acer x193w n vista so on the bottom i have this button on the monitor that says menu. i do with t hat what monitor do u have How to change the screen contrast on vista?
Your best be would be to do a restore to prior download.

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