gapman

i need help i cant play the dvd after burning in on my dvd r will not play in any of my dvd players and i do not know y it says wrong disc and will not read it can some one please help me it take like 5 mint to burn i have used Nero but will not play the last 1/2 hour of it and was look on the net and side this one is better but cant get it to play at all.