Need to Purchase The Win 7 Pro Media Disc

License is only for the PC with the sticker on it.

In the US, see below - outside the US, call your local Dell office.

http://en.community.dell.com/support-forums/software-os/w/microsoft_os/476.2-0-requesting-a-microsoft-windows-reinstallation-cddvd-from-dell.aspx

The Windows 7 Professional Reinstallation DVD will work on every single Dell system with a Windows 7 COA or a Windows 8.1 Professional label. See here:

http://dellwindowsreinstallationguide.com/a-clean-install-of-windows/the-oem-or-retail-license/

See also here:

http://dellwindowsreinstallationguide.com/download-microsoft-windows-and-office/download-microsoft-windows/windows-7-sp1-iso-download/