What version of Windows and what type of license.

e.g. Windows 8 and OEM (came with the computer), Windows 8 and retail, Windows 7 and OEM (came with the computer), Windows 7 and Retail?

Windows 8 & OEM.

Press [Windows] and [ r ] and type in slui 4 and press enter. Phone Microsoft and they should be able to assist you with the product activation.

Called Microsoft, Provided with 9 groups of numbers only to be told that my Windows installation is not genuine.

Please Assist

Can you obtain your BIOS embedded system locked preinstallation key using RW-Everything?

http://dellwindowsreinstallationguide.com/a-clean-install-of-windows/microsoft-product-activation/obtaining-your-oem-bios-embedded-slp-product-key-using-rw-everything-oem-only/

What happens when you do change key?

http://dellwindowsreinstallationguide.com/a-clean-install-of-windows/microsoft-product-activation/product-activation-using-a-windows-8-1-product-key/