Hi, sorry for my english I wanted to ask you one thing: this morning I bought the upgrade to Windows 8 from previous Windows 7 OEM that I had with my PC. Yesterday I reformatted to four times to see if the associated product key was successfully activated and so. At the same time I enrolled in the promotion for the Windows Media Center and after ten hours I received the product key to my mail box. I installed the product key and all right. My question is "It 'can be reused on the same computer code WMediaCenter sent in promotion if REINSTALLATION Operating System"? Why on many forums it is said that once activated is no longer 'valid. In waiting for your prompt response, I send you my most cordial greetings.