Which version of P-Elements?
What is your exact brand/model graphics adapter (ATI or nVidia or ???)
What is your exact graphics adapter driver version?
Have you gone to the vendor web site to check for a newer driver?
-In Windows, do NOT rely on Windows Update to have current driver information
-you need to go direct to the vendor web site and check updates for yourself
ATI Driver Autodetect http://support.amd.com/en-us/download/auto-detect-tool
nVidia Driver Downloads http://www.nvidia.com/Download/index.aspx?lang=en-us
In addition to John T. Smith's questions, I would add
a. What is on the project Timeline when these program failures occur? And what are the properties of the Timeline content?
b. What did you or the project set as the project preset based on the properties of the source media?
c. Have you found a correlation between what you are doing in the program and/or the size of the project when the problem hits?