Are you talking about Premiere, Premiere Pro or Premiere Elements?
Which version of the program are you working with?
Where did purchase or download this program from?
What operating system are you running? What processor do you have and with how much RAM?
We really need some details in order to help you.
Also, is this the same issue you asked about in this thread?
If so, please respond to the questions asked you in that thread. I will lock this one so that we won't have two discussions on the same topic.