Hi,
Under Advanced option, please choose Command Prompt, and run following commands to repair boot configuration Date:
bootrec /fixmbr
bootrec /fixboot
bootrec /scanos
bootrec /rebuildbcd
Detailed steps, please refer to this link:
Windows 8 Boot Issues? Try Fixing the Master Boot Record (MBR) or Boot Configuration Data (BCD)
http://www.techspot.com/guides/630-windows-8-boot-fix/
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Keep post.