Not sure if nero is still causing issues wioth disc burning so use with caution.
If you downloaded using ftp or http / web browser it is a good idea to start the torrent download so that it registers say 1% about ie: it just need to create the iso file in the place / folder you wanted it to.
The stop the torrent and replace the 1% torrent iso file with the ftp / http /webbrowser iso file that should be complete.
There should be a useful option int he torrent program you use "md5 hash" or "hash recheck" or force recheck any of them will verify if the iso is complete.
Once you know the iso file is complete you should make sure you have a decent disc burning software, any of the free ones will do like ease dvd burner etc.
Disc burning for dvd's is best to be done at 4x speed een if your drive can do 50000 dvd burn speed and teh disc can do 100 speed somehow 4x dvd works everytime.
Next if still not working use virtualbox.org as it emulates a pc and you can boot using the iso or dvd and so would know if it works. If iso s good and dvd is bust then either update the software / firmware for the dvd drive, check the quality of the dvd's, dvd -rw or dvd + rw works best as it is better quality.
Then you should be fine.
If both works and your pc still does not want to boot after the boot menu of the dvd then you will have to add "cheat codes" by pressing F5 in the dvd boot menu and adding say noacpi nokvm and a few others.
Please check the release page for say 4.1 gnome o 4.1 kde and the needed specs for pc's and space minm. 20gb , when you have time.http://wiki.sabayonlinux.org/index.php? ... om_Windowshttp://wiki.sabayonlinux.org/index.php? ... or_LiveDVD
PS for easy searching the forums get Wolfden's search plugin for the forums = helps a lot to search easier.
Shout if you need more help.