The error in booting phase is "mounting local filesystems /sbin/mount.vboxsf mounting failed with the error no such device", but in fedora 12 dont stop despite fedora 10 do it, it show in login window a icon warning showing the message error in booting phase.
So the solution was to quit the line from /etc/fstab and put on /etc/rc.local. Show in images on next:
Este es el post de inicio.
Pero el paso a paso se obtuve desde aqui.
En realidad no se especifica la distribucion, solo pongo FC10 pq es la que estoy usando.
Subiendo las fotos de mi promo con el applet (java) de facebook.