This is my opinion:
1) Do a backup of your database
2) Copy the entire AllMyMovies
folder to a flash drive before reformatting.
Make sure you also include your backup if in a different location.
(This way, you'll have all of your images, backups, etc.)
After you reformat:
1) Reinstall and register AllMyMovies with your license.
2) Copy contents of the AMM folder on your flash drive to the new AMM folder on your PC. Be sure to include the latest backup you created.
3) Open AllMyMovies and open the latest backup. You should be good to go!
(You can then save your database with a new name to eliminate 'backup' from being in the title of your database.)
I hope this helps