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Just repeateadly mash F11 or F12 as soon as the computer boots. It should bring you to the BIOS menu, and while you are there, changed the bios settings to LEGACY DRIVERS. Once you do that, it should show the post and the hot-keys to access bios options or boot menus and will allow you to install any OS other than Windows 8.
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!