From the Premiere Elements Information FAQ http://forums.adobe.com/thread/1042180
•What operating system? This should include specific minor version numbers, like "Mac OSX v10.6.8"---not just "Mac"
•Are you using an account with Administrator Privileges?
Run as Administrator http://forums.adobe.com/thread/969395 (Encore + "All" Premiere)
•Have you installed any recent program or OS updates? (If not, you should. They fix a lot of problems.)
•If you are getting error message(s), what is the full text of the error message(s)?
•What were you doing when the problem occurred?
•What other software are you running?
Tell us about your computer hardware. How much RAM is installed? How much free space is on your system (C:) drive?
•Which version of Quicktime do you have installed?
It is very late where I am and I am just seeing your thread now.
Please review the following to see if there is anything in them that applies to your situation.
Later in the morning I will look for your follow up.