In previous Windows versions, if the user wanted to boot into Safe Mode, he needed to press “F8” key at system startup but this good old and well know hotkey no longer works in Windows 8. Microsoft has replaced it with a new hotkey.
The new hotkey is “Shift+F8“. So now you need to press “Shift+F8” keys together to access Safe Mode option in Windows 8. I can’t understand the reason behind this move. May be they’ll use “F8” hotkey for some new stuff? Who knows?