What is the difference between windows 7 versions?
 

Hi i tried installing Office Professional 2007 Serial but i cant find my serial and every Microsoft Office 2007 Ultimate i boot up the computer it Microsoft Office 2007 Professional Activation Key straight to the setup screen. I have a windows 7 Microsoft Office 2007 Ultimate Product Key with a serial and i want Microsoft Office Standard 2007 Keygen install it but how can i get to the setup of windows 7?