I recently had to get a new computer(Lenovo ideapad, not sure if the model is important, if so, it's a Z580.) but I had to wait until today to get it because it was then only available on Windows 8. I can't stand Windows 8, and I can get an install disk[Edit: For Windows 7] on Monday, but my question is, how exactly would I go about doing that, and what would it do to the computer in terms of dual-boot, or cross-compatibility, or something else?