I bought a genuine Win 8 Pro licence today and when I installed the free WMC it changed my licence key to the one sent in the WMC email free from Microsoft. Right, all ok so far but I wanted to use the licence that I bought on my laptop only to find I was getting the message that the licence had been used even though it was not being used if you know what I mean ! Then I used the phone activation using the licence key sent to me by Microsoft with my laptop internet connection off and when I entered the codes supplied my laptop is now showing Activated so all good. Now, I have one of the 'free' WMC keys that was emailed to me by Microsoft, if I enter this key will it install WMC and change the licence key as it did on my other pc so I am all legit or do I risk my activated laptop being unactivated, if that can happen ??