I need help for clone dvd?

hi, I just need help for clone dvd…I just burn flight plan, I tried to copy the main movie only and I want to have back up…everything is fine but when I put to my dvd player nothings happened…it just a blank screen…I am using memorex 16x 4.7gb dvd cd…my burner is NEC 16x…can anyone tell me how to burn dvd by clone dvd in easy way…I really don’t know much about this kind of stuff specially copying dvd…What is VSO burn Engine? what is alcohol 120% for? Is there paticular do I need to set in order to copy dvd? I really thanks for your time…hope you can help me about this…

You are probably using the “wrong” CloneDVD. Try the “real” one:
http://www.slysoft.com