Ok so I joined the Windows Insider Program. I want to reinstall the version of Windows that I had before. I have tried to reinstall it on the disk that is currently there using the Media Tools, however it still gives me the previews. I have clicked leave program and it gives me all the options of restoring windows, but when I do it won't let me reinstall it on my current disk. If I put in a new hard drive (need to upgrade to 1tb anyway), will it undo this and let me get my old OS back or will I be stuck with the previews once I sign into my Microsoft account?