Hi Margymarie!
I don't know if you can deregister your PE any more. Do you still have it?? If so, you want to do a Factory reset. Here is the official info site:
https://www.entourageedge.com/support/
Ask for help if you still need it in the entourage section if you haven't already.
Depending on the version of the software your PE is running, the instructions will be different. Let us know what you have and we can help you better.
Good luck!