The zips offered at Get-Haiku contain anyboot images. The hint is in the filenames: haiku-r1beta1-x86_gcc2_hybrid-anyboot.zip 
I expect, you did unpack the zip and burned the actual ISO. And made sure the boot order in you BIOS tries the CD drive first.
I don’t have a concrete idea what might have gone wrong… Personally, I prefer to create a USB stick for installation.