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.
Our friend and comrade IronFly has reached his 10,000th post to our little Community. During the last 4 years he has helped countless Acer customers providing help, advice and answers. The Acer Community team feels honored to count you as our friend. Thanks IronFly!