This article describes how to select a default printer in Windows 7
You can set up a default printer that will be used every time you print so that you don’t have to select a printer each time. Here’s how to make a printer the default from your computer:
1.Choose Start→Devices and Printers.
The Devices and Printers window appears. The current default printer is indicated by a check mark.
2.Right-click any printer that isn’t set as the default and choose Set as Default Printer from the shortcut menu.
If you right-click the printer that is already set as the default, the Set as Default Printer command won’t be available on the shortcut menu.
3.Click the Close button in the Devices and Printers window.
Your new settings are saved.