FallenHype

I'm new to linux, but i want to learn a bit more about it. Yesterday i've downloaded the 3CD 10.0 community and burned it to a bootable CD with the cdrom.img. I booted from CD1 and the cd started, but suddenly i got the following "error": That CD-ROM does not seems to be a Mandrake installation disc. I can click cancel, yes (retry with other disk) or no. When i cancel i get a question to insert a driver floppy disk. Does anybody know what is wrong here? Does the CD has to be burned on a special way? Wrong download?