1. Click Start, point to Settings, and then click Control Panel.
2. Double-click Display.
3. Click the Settings tab, and then note the settings for Colors and Screen area.
4. In the Colors or Color Palette box, click High Color (16 bit).
5. Move the Screen area or Desktop area slider to 640 X 480 pixels, and then click OK.
6. If you are prompted to restart the computer, click Yes.
if this doesnt work see below
Note If you change the video refresh rate to a setting that is not supported by the monitor, you can damage the monitor. See the documentation for the monitor or contact the manufacturer of the monitor to determine compatible refresh rates
before you change the default refresh rate setting for your video adapter.
To determine a refresh rate setting that is supported by both your video adapter and the monitor, follow these steps:
a. Click Start, point to Settings, and then click Control Panel.
b. Double-click Display.
c. On the Settings tab, click Advanced or Advanced Properties.
d. On the Monitor tab, make sure that the monitor is selected. If an incorrect monitor is selected, or if a standard or unknown monitor is selected, click Change, click the manufacturer and model of the monitor, and then click OK.
e. On the Adapter tab, click the Refresh Rate box.
1. Click Start, click Run, type dxdiag.exe in the Open box, and then click OK.
2. On the More Help tab, click Override.
3. Click Override Value, type a refresh rate setting in the Override Value box that is supported by both your video adapter and the monitor, and then click OK. Try one value at a time.
Note Typical values are 60, 62, 72, and 75.
4. Click Exit.