Moving this Discussion to Premiere Pro Forum Discussion.
More information needed for someone to help... please click below and provide the requested information
-Information FAQ http://forums.adobe.com/message/4200840
Such as... Windows or Mac and computer details might help someone help you
Firstly, have you tried holding opt/alt while launching the Program? That will reset to default preferences.
restart your machine.
But seriously, hold down Shift + alt/option when launching premier to reset the prefs.