I have installed windows vista and Nero.Ultra.Edition.Enhanced.v7.8.5.0.


When I want to burn cds everything goes alright.
However when I want to burn dvds everytime it reaches only 1% and then shows PMA Update failure and could not perform Disc-at-once.
So,the burn is cancelled and the dvd is lost...
I have an LG DVDR.


Also when I burn the dvd automatically when I create a movie with ConvertXtoDvd everything goes OK.

Does anyone know what it has to do with?
Is it a software or a hardware problem.

Thanks a lot.