@tonymclau330
Try the following:
For Windows Vista / 7
1. Press the Fn+Left Arrow Key for brightness down and Fn+Right Arrow Key for brightness up (the Fn key is located at the left side of the space bar)
2. If that won't work, go to Start > type Power Options and click on the Power options icon.
3. Adjust the screen brightness bar below.
Good luck.
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