Vision burned only 1st of 2 movie DVD

I used Nero Ultra 7 Vision for the first time last night to put together a 2 movie DVD. It ran the Title and Menu design fine, but when I went to burn the project, it only burned the first movie and then hung. I’ve got 524k ram with an MD Sempron 3100 CPU running Win 2k Pro, so I don’t think it’s a system resource problem. Any ideas?