Do you have problems with video display with only these .mts files?
What video card/graphics card does your computer use? And what is the computer operating system on which you have installed Premiere Elements 10?
Please review the following and let us know if you are involved in the Premiere Elements 10/NVIDIA GeForce known issue.
What is the source of these .mts files and what are the video audio properties?
Let us start here, and then we can decide what next based on the details of your reply.