There are two options to choose from during the Windows 7 installation process:
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Upgrade. This option replaces your current version of Windows with Windows 7, and keeps your files, settings, and programs in place on your computer.
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Custom. This option replaces your current version of Windows with Windows 7, but doesn't preserve your files, settings, and programs. It's sometimes referred to as a clean installation for that reason.
In this article you'll find detailed instructions for installing Windows 7 and reinstalling Windows 7.