It's possible that it didn't install correctly. I would check for smudges or scratches on the discs and then try using them again. You could also try restoring default settings in your bios as this has been known to fix similar problems on quite a few devices.
F12 on power on to enter bios, F9 for defaults. F10 to save.
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.