The major question is "What video card/graphics card does your computer use?" If it is a NVIDIA GeForce card, there is a major problem using Premiere Elements 10 on that Windows 8.1 64 bit computer. There is a known Premiere Elements 10/NVIDIA GeForce problem whose resolution is to roll back the driver version to about May 2013. In computer operating system such as Windows 8 or 8.1 64 bit, this is not possible because the older NVIDIA driver versions do not go back far enough.
If you are involved in the Premiere Elements 10/NVIDIA situation, then please read the Announcement on this at the top of this forum as well as the following
Any questions or need clarification, please do not hesitate to ask.