What computer operating system and what video card/graphics card does that computer use?
There is a known problem with Premiere Elements 10/NVIDIA Ge Force which is resolved by rolling back the driver
version to May 2013. Let us determine first if that applies to your situation.
If not, then we can move to other troubleshooting possibilities including properties of your source media, do you
have the latest version of QuickTime installed on your computer, and other.