Fresh Windows 7 Install Using Upgrade License Key

I have a Windows 7 Pro Upgrade key.  However, I like to install to a fresh disk.  I entered the key during install, but I was told it was an invalid key.  This had me a little worried.  Here is how to solve the problem.  I used option #2, the registry hack.

I installed to a fresh disk.  After installation, I tried to activate, but I was told that the key was only valid for upgrades.  Here is a fix, assuming that you are legally entitled to upgrade, meet the requirements, and have an appropriate key:

• Open regedit
• Go to key HKEY_LOCAL_MACHINE/Software/Microsoft/Windows/CurrentVersion/Setup/OOBE/
• Change key MediaBootInstall from "1" to "0"
• Close regedit
• Open an administrative command prompt and type the following command
  C:\>slmgr /rearm
• If it works, a dialog will appear saying "Command completed successfully.  Please restart the system for the changes to take effect"
• Reboot and follow the activation procedure