Uninstall and reinstall the windows 8 operating system

I have a genuine windows 8 installed in Dell inspiron 15, I have a requirement where I have to install a linux operating system.

Since I have the genuine copy of windows I would like to know if there is any procedure where I can uninstall, install linux and reinstall windows with the same genuineness . I can see the product key, in the properties of "Computer" if that can be used.

I had also checked for the refresh, reset and restore of windows but these procedures did not talk of non windows OS.

thanks in advance.