Welcome to the forum.
First, what OS version and PrE version are you using?
When you state, "unlock my video play back," exactly what are you referring to? What is "locked?"
Good luck, and please let us know a bit more.
More information needed for someone to help... please click below and provide the requested information
-Premiere Elements FAQ http://forums.adobe.com/thread/1042180
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?
-If 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