Thank you for your answer, but it didn't work... every time I choose bootting from the disk, I get an error message ("disk error: 0X0C"). I'm reading more about this error message to find out what's wrong...
Perhaps the cd was copied in a wrong way... I'm pretty sure it is not the BIOS or the cd drive because I installed and old (very old) distro of Corel linux 1.0, and it worked perfectly.
thank you again.