Windows 95/98/NT/2000/XP
1. Click Start, and go to settings  
2. Click Control Panel                       
3. Double Click on Display
4. Click on Settings
5. Move the Slider to 800 X 600
6. Click Apply   
7. Click OK

Windows Vista
1. Click Windows logo at left bottom of screen.
2. Click Control Panel                       
3. Double Click "Personalization"
4. Click "Display Settings"
5. Move the Slider to 800 X 600
6. Click Apply   
7. Click OK

NOTE: On any computer running Windows, you can simply go to your desktop, right-click and select "Properties" or "Personalization" to access your display settings.

 MAC
1.Click the Apple Menu
2.Scroll to Control Panel
3.Click on Monitor
4.Click the Options Button
5.Set the resolution to 800 x 600
6.Click OK