Hey guys. I'm having trouble with my newly built computer. I got my dad's windows 7 disc that he got from work, but it doesn't appear to have a product key with it. I saw it say that the product key will activate in 30 days, so I waited those 30 days to see what happened. After those 30 days it said that it is not 'genuine'. I don't have to purchase a new product key do i? If that's the case I might as well just get windows 10. Can anyone help me?