1. Start-Control Panel.

win 7
2. Click System and Security.

win 7
3. Click Power Options.

win 7
4. Drag the scroll bar to adjust the screen brightness.

win 7
You can also press the Win+X key combination:

win 7
Time: 2017-06-09Source: Huajun InformationAuthor: Hard work haha
1. Start-Control Panel.

win 7
2. Click System and Security.

win 7
3. Click Power Options.

win 7
4. Drag the scroll bar to adjust the screen brightness.

win 7
You can also press the Win+X key combination:

win 7