Clean Install Windows 7 With Upgrade Media and Product Key

Retail version of Windows 7 has two main primary type of licenses – full or full package product (FPP) and upgrade, where the most obvious differences between full and upgrade versions are different prices for full and upgrade license, and customers have to possess an existing Windows license to be eligible for upgrade license.

 Clean Install and Activate Windows 7 with MediaBootInstall Registry Hack

1. After booting up, ensure that no Windows Updates pending task which requires a system reboot to finish installing.
   Tip: Normally, an orange-colored shield icon will be displayed next to Shutdown button in the Start Menu Power Button or at notification tray area if a restart is required.
   If reboot is required, restart the computer to allow any pending updates is installed.
2. Run Registry Editor (RegEdit).
3. Navigate to the following registry key:
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Setup\OOBE
4. In the right pane, change the value data for MediaBootInstall from 1 to 0.
   
   
5. Open an elevated command prompt as administrator.
   Run the command below to reset Windows 7 activation status:
   slmgr -rearm

Tip from 

http://www.mydigitallife.info/clean-install-windows-7-with-upgrade-media-and-product-key-on-formatted-or-empty-blank-hard-drive/