Brightness on windows 8?

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The brightness on Lenovo laptop with windows 8 is really messed up. Its either way to dark on its brightest setting or changes every minute to as bright as it can get, to barley being able to read it. I don't know why its doing this. I am using google chrome if that matters. Please and Thank You.
None of these really helped. I wanted to find a solution without having to call the company. Thanks anyway I guess........