Ok, i'll try to be more specific...
If i boot the CD it loads and then first installation screens appears... everything fine so far, then i select the " install sabayon " option of the menu and the installation starts... the " load bar " fills up and it seems like it's working but no graphic at all, just a blinking ( - ) sign the upper left corner of the screen, nothing more happen, i can change the TTY alt+ctrl+F1 and the bash command line shows up, and it is already logged as root... but no installation of anything, no graphic KDE or anything more.
If i try the " virtual sabayon " running the DVD right from the Windows Desktop, then the error shows up, the one described in the other post.
Now, my DVD burner is an ASUS DVD, brand new, only 3 months of life on it and no problems.
...the DVD was burned in a 4x speed so no problem there.
And im sorry for my english, but im from Argentina.