I have a OEM computer preinstalled with Windows 7. So, its BIOS originally has SLIC 2.1, to facilitate OEM activation of Windows 7. Suppose that I have recently formatted the hard drive, performed a clean install of Windows 8 and activated it. And now, I want to remove Windows 8, and return to using Windows 7. The questions are: 1. After formatting the hard drive, can I still install Windows 7 and perform OEM activation of Windows 7? 2. Does the installation and activation of Windows 8 affect the SLIC 2.1 in the BIOS? Well, I just want to make sure that I can return to using Windows 7 anytime in the future. Thank you for your information.