From the Premiere Elements Information FAQ http://forums.adobe.com/thread/1042180
•What version of Premiere Elements? Include the minor version number (e.g., Premiere Elements 9 with the 9.0.1 update).
•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?
•Have you installed any recent program or OS updates? (If not, you should. They fix a lot of problems.)
•What kind(s) of image file(s)? When talking about camera raw files, include the model of camera.
•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?
•Has this ever worked before? If so, do you recall any changes you made to Premiere Elements, such as adding Plug-ins, brushes, etc.? Did you make any changes to your system, such as updating hardware, printers or drivers; or installing/uninstalling any programs?
And some other questions...
•What are you editing, and does your video have a red line over it BEFORE you do any work?
•Which version of Quicktime do you have installed?
•Have you viewed the tutorial links at http://forums.adobe.com/thread/1275830 page to learn the program?
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?
For 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
What computer operating system is your Premiere Elements 9 running on? Are you running the program from the 9.0.1 Update?
1. Make sure that you are set for Run As Administrator and running from User Account with Administrative Privileges; you have the latest version of QuickTIme installed on the computer with Premiere Elements 9.0/9.0.1; your video card/graphics card driver version is up to date according to the web of the manufacturer of the video card/graphics card.
2. If no help from "1", delete the settings file named Adobe Premiere Elements Prefs file. Assuming you are working with Windows 7, 8, or 8.1 64 bit
Local Disk C
and in the 9.0 Folder is the Adobe Premiere Elements Prefs file that you delete. If that does not work, then delete the whole 9.0 Folder in which the Adobe Premiere Elements Prefs File exists. Make sure to be working with Folder Option Show Hidden Files, Folders, and Drives active so you can see the complete path cited.
3. If that does not work, the go for new installation files from the following web site and then install them inserting your purchased serial number
It is critical that you read the "Note: Very Important Instructions" at that web site; otherwise, you will get an Access Denied message.
In general terms,
a. Is your computer optimized - ccleaner run through (regular and registry parts)
b. check for pile ups of preview files, conformed audio files, conformed video files?
Let us pause here while your review and consider the above.
Any questions, need clarification, do not hesitate to ask.