I just got an Asus X551 laptop today. I hate the windows 8.1 and wanted to install windows 7 ultimate. I can't get 8 removed. 7 won't overwrite and load up. Says " Windows setup experienced an unexpected error. To install windows restart the installation." A restart has the same outcome everytime. I have tried using several discs i have and always the same. I bought this for my woman for Christmas. I know she can't deal with win 8. I need to get 7 on there. Someone please help me out.