The test presentation ran fine - no problems. I have only created one presentation at this point so I really can't answer the question about happening with "all" presentations. I have made several modifications to this one and it has frozen my PC in previous iterations as well. I have a Dell Dimension 8200 with a full gig of memory, two 80GB hard drives, and an NVIDIA GeForce3 Ti200 video card running at 1024x768 resolution. The sound card is a Sound Blaster Audigy Platinum eX. I run many applications on my PC. This is the only one that has caused this sort of total lock-up. The presentation includes 34 slides, all in jpg format. Sizes range from 38 to 1,033KB, which is well within the guidelines I have seen for P2E. Only six are in excess of 1,000KB. There is a single sound file, in mp3 format. What is most puzzling is the fact that more often than not the presentation runs fine. Steve