Installing freeBSD

[Huu Daud]

Hello,
Greetings,
Iam new to this forum and to the Unix.My interest is to install and configure freeBSD on my desktop computer.I have downloaded the iso for i386.
and burn on the CD and DVD.My problem is when I boot from the CD or DVD ,it didnt send me to the screen for selection options as it is shown on the web.Instead, it sends me to the A drive prompt(DOS).Is it possible to install from the DOS?.How then.
Thank you for your help
huu