Disable safe boot mode?

I want to install my windows 8 disc, but when I was to start in with the hard shell, it says that I need to turn off safe boot mode before I can do so.

I have a Z87 Sabertooth from ASUS MoBo and I can find the option, but it's greyed out. Any ideas?

Things I've tried:
Remove Security key parameters
2 answers Last reply Best Answer
More about disable safe boot mode
  1. Still got nothing, been searching for hours! please help
  2. Best answer
    Try different options in the Boot Menu. Perhaps enable both UEFI and Legacy, try Boot Override?
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