Moved to the Premiere Elements Forum.
Is your video driver up to date?
I'm with Bob. Version 12 had an especially bad conflict with nVidia graphics drivers.
Assuming you've got an nVidia graphics card, go to the nVidia site and ensure you have the latest drivers. This fixes it with most versions of the program -- though, as I've said, version 12 had a particularly tough conflict with the nVidia drivers.
Thank you, I have update my driver and Premier elements 12 is now working.
Thank you all very much