I just got my brand new Gigabyte motherboard and AMD Phenom II in the mail and was super excited to use them, I placed them in my computer, along with the old hard drive that has windows 7 on it, only to discover that Windows wouldn't boot, it would take me to startup repair and keep saying it fixed the problem then restarting then doing it all again. Someone told me that the os drivers would be for the old mobo so I need to do a clean install of Windows 7. Here's the issue, though, my old system came with Windows 7, no disc, but it has the serial key on the side. How am I to get Windows 7 onto my new system to where it will actually operate, am I going to have to spend another $100 on a new OS? Thanks.