You have posted in the wrong Adobe Forum. If you have Photoshop Elements 12, you should be posting in the Adobe Photoshop Elements Forum, not the Adobe Premiere Elements Forum (video editing).
Either repost your question or wait for a moderator to see your thread and place it in the appropriate forum.
Some questions to think about...
a. How are you opening the program? From the desktop icon? If so, how far do you get....do you get the Welcome Screen and does it stay open? Is it only when you hit Welcome Screen Organizer or Editor Tab that everything closes/disappears?
b. What computer operating system are you running your Photoshop Elements 10 on? What do your computer resources look like? Is your Photoshop Elements 12 issue "it never worked before" or "it worked before but not now"?
Lots more questions. But lots more details needed.