How To Install Win 7

Written By the world tutorial on Jumat, 09 September 2011 | 06.45

There are two options to choose from during the Windows 7 installation process:

Upgrade. This option replaces your current version of Windows with Windows 7, and keeps your files, settings, and programs in place on your computer.
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.

source from : http://windows.microsoft.com