Please explain the issue in detail as to when exactly does your Premiere Pro(PPro) crash and on which OS?
Do you get any error message before crash or perform any specific workflow after which PPro CS6 crashes?
Make sure your graphic drivers and Premiere Pro CS6 are up-to-date. If not, update them and check.
Attach the crash logs for futher research.
[Moved the discussion to Premiere Pro forum]