You may need to calibrate your monitor! There are many ways to do it, and some of the top notch ways may cost you some money... but at least for now... take a look at... this!
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Make sure you can see the clear lines between 0 and 100 for grayscale and the colours.
Different monitors require different ways to change their settings. You may have buttons on your monitor, you may need to go into your settings.
For more information on calibration check out the following links:
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I just wish there was a way to magically calibrate everyone's monitors...
One day, I'll have to get one of those calibration "pucks."
Another important topic for proper viewing:
Making sure the photos you edit are saved in the sRGB colour-space, to maintain your images hues.