Panel Sets Problem

Hi, with flash mx i am having a problem with the panel set layouts staying the same for each time i load up flash. Even if i select the default layout it wont stay the same for the next time i load up flash.

I am running windows 2000 pro and have full administrator access.

Any ideas ???

Also can someone tell me what files i need to delete so that flash runs as if its the first run?

Thanks in advance, Chris