Shades is a FREE utility for controlling the brightness of your screen. It runs in the background providing always-available fine-grained control over the brightness of your display via a slick Mac-like interface.

If your computer screen is still too bright even if you set the brightness to the minimum, here is the freeware you might need!

Download Shades here: Shades

After the install you'll be able to adjust the screen brightness. Here are my prefs for this application:

You can also use Hot Keys