To enter BIOS setup during a start-up in Windows 8, you MUST do a complete Windows 8 shutdown. The standard Windows 8 shutdown does not do a complete shutdown as previous versions do. To enter setup, press F2 during POST during a restart or after a complete Windows 8 shutdown. Search Windows 8 shutdown on the web.
My apology on my previous post. Your press the Delete key not F2 during start-up (after complete shutdown) or restart. Windows 8 uses hybrid shutdown, so you would need to shut the computer down while holding shift, or to use the Acer Power button icon in Windows. F2 key should bring up the boot menu.
This is an older thread, but I see a lot of traffic to it so I want to provide an official solution for it. The thread will be locked due to it's age, please search for an updated thread or feel free to post your own!
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Member RevoMaxx is quickly moving up the ranks of Acer Community. He joined us in September and is already making a difference. It's great to see new members like him make a difference only after a few months. Thanks RevoMaxx!