+ 1 Votes RAM? Clendanielc December 18, 2012 at 9:21pm PST I would see if bumping up the RAM to at least 8 GB would do the trick. My guess would be that the processor can't handle the load because there is not that much RAM to use. I believe Windows 7 uses at least 2 GB just for the operating system to run. If you try to use a program, like a video program, that uses a lot of RAM; you might find yourself with a PC that will have issues like shutting down. + 0 Votes Bad Power Supply or CPU Overheating Divergex December 19, 2012 at 1:44pm PST I can think of two possibilities: first, your CPU may be overheating. Converting video is processor-intensive and the processor can get rather hot. At a certain point a CPU will shut down in an attempt to avert permanent damage. I would remove the heatsink/fan assembly and clean it thoroughly, then clean off the CPU and apply fresh thermal paste, then reinstall the heatsink/fan assembly. Another possibility is your power supply. If it is not supplying enough wattage it may cause a shutdown. If the wattage is fine, it may be starting to fail. + 1 Votes PC Wizard Clendanielc December 21, 2012 at 5:34am PST To see if it could be the CPU overheating, install this program called PC Wizard. Its a life monitor of everything that is going on with the system in real time. Here you can see if it is the CPU overheating or maxing out. This also goes with the RAM. You will have to watch it when you try to convert a video file. This will help determine if it is really a hardware issue and not a software issue. Here is the link to PC Wizard: http://www.cpuid.com/softwares/pc-wizard.html Hope you find out the solution to your problem.