Go to Start then Settings then click Control Panel

In the Control Panel, double-click Display

The Display Properties window should pop up. Choose the Settings tab.

In order to change the resolution, adjust the slider control in the bottom-right of the Window. It will probably range from 640x480 on the far left to over 98 on the right hand side, but this depends on the age of your computer. As discussed on the previous page, the lower the resolution the larger the on-screen graphics.

You can also adjust the number of colours windows can display. It's best to leave this on the highest value possible.

Click on OK

A warning message should pop up as shown. Sometimes when you set certain screens into certain resolutions, then can go black and not recover. Should this happen, simply wait 15 seconds and the display should come back on its former resolution.

As you alter the screen resolution, the refresh rate might also change automatically. If the refresh rate is too low then the screen will visibly flicker, which tends to tire people's eyes.

After you have changed your resolution, you can check the refresh rate by clicking on the Advanced button. A dialog will come up. Click on the Monitor tab.

The Refresh Frequency box should read at least 75 Hz. Anything below 75 Hz should be avoided. You should set it to as high a value as you need - 95% of people can't notice a flicker at 85 Hz so this is usually a good choice.