|Okay, I just checked out my BIOS screens especially for you. Mine's an Acer laptop too, though not the same model as yours, but hopefully it has a similar BIOS.|
On the main BIOS screen there is a menu along the top.
Use arrow key to highlight 'BOOT' in the menu bar.
Now you see "Boot Priority Order"
Yours probably has "IDE 0" as first boot device,
and "CD/DVD as second boot device.
The first boot device (IDE 0) is already highlighted.
Press 'F6' to swap them round, so that first boot device is
Now press 'F10'
Highlight "YES" at the prompt (may already be highlighted) and press <Enter>
PC will reboot, this time from the CD/DVD drive first.
You can leave the BIOS set like that permanently so you don't have to go through all that process again next time, just don't leave a bootable disc in the drive unless you really want to boot from it.