I had win7 installed, I found out how to installe Win8 without CD or USB, by creating a partition, setting it as active, and put there the win8 files, then with command prompt I type boosect /n60 (letter of partion win8 files), restarted my pc, the installation screen appeared, I installed Win8 where Win7 was, after all that, I get a screen with multiple choice to boot the OS or Windows setup, ...
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