Win 7 does have some issues with nero also I believe that the VSO burn engine has had some problems off and on through the different versions.
A lot of us has switched over to the Imgburn engine and have never looked back , it is a far better burn engine with more compatibility with different media.
It is also free.
If you would like to download and install Imgburn you may find that you will like it better also.
If you look in StormJumpers signature you will find some excellent directions on setting up Imgburn with DVDFab.