Secure Your Windows CD-Key (For Vista and 7)

As you know everytime you activate a Windows Installation your Product Key can be retrieved via Software means.
Don't believe me?
Download this and retrieve your Product Key in Clear Text.
So is there an alternative solution so people will not steal your Product Key from your computer when you are not looking?
Yes there is.
Open Command Prompt with Administrative Permission and Run the following commands.

slmgr /cpky

If you try to retrieve your Product Key again with the same software, you will get this.

The Registry Entry Containing the Product Key has been cleared and Windows remains activated!