Choosing Resolution Size
For Windows XP: Go to your Control Panel then click the Display icon. Click on the Settings tab and look in the bottom left corner. Your resolution size should be listed there (example: 1280 x 800).
For Windows Vista: Go to Control Panel, Personalization, Display Settings. The monitor tab automatically comes up. Look in the bottom left corner. Your resolution size should be listed there (example: 1280 x 800).