I recently installed Windows 8 Pro on PC 1. Then I saw that in windows's site there is a promotion for Media Center for free.
After I received the key From Microsoft I entered the key and followed the procedure. Everything went successfully.
But I see that now my windows product key has changed and the os is called windows 8 pro with media center.
My question is if I can use the serial key that I received during the Windows 8 pro (without media center) on another PC as I see that now PC 1 is running Windows 8 Pro with media center( with different product key).