I have built a 4 minute video and rendered it using the .avi windows extension. I did it in PAL SD YUV and the resulting file is 4,854,483. This is using Vista OS on a laptop that had 14 Gig of mem. left on a 100GB drive. It seemed to go well but when it tries to play in Windows Media Player the time ticks off but there is nothing but a black screen. Any ideas?