Hi guys. I'm currently rebuilding a system that currently has genuine Windows 10 on it. I'm swapping out the hard drive for an SSD and putting in a new motherboard and processor as well, so I need to reinstall the OS. I have a Windows 7 OEM disc, but its product code has already been used. I'm wondering if it's possible to install Windows 7 without activating it, and then pay for and download Windows 10.