Computers come with a recommended resolution setting but you can change this to suit your personal preference.If you would like content to be bigger decrease your resolution. If you would like content to be smaller increase your resolution. You can find details of how to do this below.
In Windows 7/Vista:
- right click on the desktop
- click Personalize
- click Display (bottom left of screen)
- click adjust resolution
- select a resolution from the Resolution drop down menu.
- Click Apply
In Windows XP:
- right click on the desktop,
- click Properties
- click Settings tab
- move the resolution slider
- click Apply
Sources:
Change your monitor resolution (Windows Vista/7)
Change your monitor resolution (Windows XP)