The system is based on an Asus P4P800-E motherboard with an Intel Pentium 4 3.2 GHz processor and 1Gb of Ram. Video card is a Matrox Millenium G550. There is a Matrox RTX100 board installed. I am running Premiere 1.51 with the latest Matrox tools. The mouse is a Logitech, but I had the same problem with a different mouse and driver. There is a PCI firewire 800 card, but again, I had the problem before this was installed. The only software installed is Premiere, Audition, and Encore, WinDVD creator, WinRip, WinDVD 5 and Easy CD creator. I will email you the system file. I have recently installed the excellent Digisuite, but the problem predates this. Many thanks for taking the time to look at this problem.