As the note says at the top of this forum, we need clues in order to solve these mysteries.
What is your operating system? Is it 32-bit or 64-bit? What version of the program are you using?
How fast is your processor? How much RAM do you have and how much free, clean, freshly defragmented space is on your C or main drive?
Are you editing on your C drive or to a second or external drive?
Is the program crashing while you're editing or before you can even start a project?
What model of camcorder is your video coming from, and which project settings did you select when you started your Premiere Elements project?
Also, what is the exact text of that error message? That will possibly hold a key to the problem.
Happened to me when first using my product, I didn't have enough memory for it. Was good excuse to go get a new computer!