To change your screen resolution
Click Start, click Control Panel, and then double-click Display.. 
On the Settings tab, under Screen resolution, drag the slider, and then click Apply. 
When prompted to apply the settings, click OK. Your screen will turn black for a moment. 
Once your screen resolution changes, you have 15 seconds to confirm the change. Click Yes to confirm the change; click No or do nothing to revert to your previous setting. 

Notes:

A higher screen resolution reduces the size of items on your screen and increases the relative space on your desktop. 
Your monitor and video adapter determine how much you can change your screen resolution. You may not be able to increase the resolution above a certain level. 
Changes to screen resolution affect all users that log on to the computer.