Once it finally came to finish but after boot it appeared written on desktop that SecureBoot configured wrongly
Instale o Windows Update mais recente para o Windows 8.1. Esta mensagem foi removida com a atualização KB2887595 (pacote cumulativo de atualizações de novembro).
This update package fixes the issues that are documented in the following Microsoft Knowledge Base (KB) articles:
2902864 Update removes the "Windows 8.1 SecureBoot isn't configured correctly" watermark in Windows 8.1 and Windows Server 2012 R2