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When you first turn on your computer, a ``bootloader'' is responsible for initiating the start of an operating system, such as Ubuntu or Windows. \marginnote{A \define{bootloader} is the initial software that loads the operating system when the computer is powered up.} When you installed Ubuntu, you automatically installed an advanced bootloader called \define{\acronym{GRUB}}. \acronym{GRUB} allows you to choose between the various operating systems installed on your computer, such as Ubuntu, Windows, Solaris, or Mac \acronym{OS~X}. If Ubuntu was installed first, then Windows was installed, the Windows installation removed \acronym{GRUB} and replaced the bootloader with it's own. As a result, you can no longer choose an operating system to use. You can restore \acronym{GRUB} and regain the ability to choose your operating system by following the steps below, using the same \acronym{DVD} you used to install Ubuntu.
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