Hi, I have the same problem with video builder 5.5 ... After many tests, I think the problem is due to the volume of data to burn : My project as 1200 vues in 17 slides (17 PTE 5.5 projects), 9 pages (2 slide by page), with effects, commentaires and music, 1 hour on the DVD. When I try with only 16 slides, it's OK. I try to replace the 17th --> runtime error I try with a lot of little slides (more than 17) : it's OK, but the slides are small. I try with Windows XP SP3 (DirectX 9) and with Windows Vista SP1 (DirectX 10) --> runtime error for both. The DVD burner as no importance : when I burn without writting the DVD, I have the runtime error. My computer as 4 Go of memory and INTEL Core 2 Extreme X6800 - 2,93 GHz processor (I make very big projects with Pinnacle Studio and have no problem). I hope my english is comprehensible for you ....... Quartz