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If you have installed two (or more) operating systems on your computer (dual-boot),  this trick is going to be quite useful to you. This brief tutorial will show you how to set Windows 7 as the default operating system on the main window which appears right after you turn your computer on. Such a window  lest you decide what operating system you want to select and use. Usually, after installing Windows Vista, for example, on a computer which is running Windows 7, the computer will automatically set Vista as the default operating system. This article will teach you how to revert this situation.

1. Click the Start icon.
2. On the Search field, type msconfig and press Enter.
3. The window configuration window will appear. Click the Boot tab.
4. The Boot tab shows you a brief list containing all the operating systems installed on your computer. It will also shows you which OS is set as the default one.
5. To change it, click the operating system you like and hit the Set as Default button.