■ [strike][/strike]Okay, so I bought my pc from my cousin and decided to just upgrade along the way. So far I upgraded the psu and gpu and now I think it's times to upgrade the cpu and mobo. So, I am upgrading from an intel core i5 750 and idk what novo to an amd fx 8320 w/ a Gigabyte GA 990fx. I was wondering if I needed to buy or reinstall windows 7 or I could just install the cpu and mobo then just plug in the hard drive and continue like normal. If I have to reinstall my windows can I do this without the key? Since my cousins older brother made the pc and no longer has the disc or key