I bought a new LITE-ON external DVD burner which came with Nero 7 Essentials. I used WMM to meke some clips from family photographs. I burnt some VCDs using these clips on this burner. They worked fine on my computer and Sony DVD player. I used the same clips to burn DVDs and they do not play on my DVD player.I get a message saying: 'Disk is dirty'. I used new Maxell DVDs. I wanted to use Verbatim but that was NOT the media recommended by LITEON. Also, I did clean the disks after I kept getting this message. I used a three disks and then I gave up. I e-mailed Nero for any solutions more than a week ago and I have not heard from them. If any one of you could help me , I would really appreciate it. Thanks in advance.