As soon as you boot your computer, press F2. This is for Acer machines. If not press "Pause" on your keyboard right when you see the POST Screen or Acer screen and look for any info that tells you what to press to enter the BIOS.
Please join me in congratulating IronFly who is the first Acer Community Member to achieve the rank of ACE Pathfinder. IronFly has shown a consistent willingness to help others and has worked hard to earn this new Rank. Congrats and Thank You IronFly.