PHPBB switch

in order to switch to PHPBB all you have to do is the name of the SQL database that this forum uses and that database password (usually admin password)
Most forums use same database access so there is no need to edit anything.

PHPBB will come with a number of improvements.
user ranks, ton of plugins such as "blocking advertisers" and more.
PHPBB is easier and has far larger community if support is ever needed
PHPBB is much more up to date then any other forum system, thus more secure

Transfer of database is simple steps during installation process. Instal is simple: u create a folder in your web root named "test" and upload all the phpbb install files there. Then you point your browser into "test/install.install.index" or something like that and follow setup proccess.
Once done,you have to delete your "install folder" and forum should be up and running.

During the setup you will specify sql database and password used by this current forum ( make sure you disable this forum first temporary for testing purposes and backup sql database and current  forum with menus it provides under admin utilities or whereever)

new forum will import all the topics and pols and what ever else enter that database so transition is very eazy.

If you like what it looks like and how it works, you can make that change permanently or simply deleting that forum "test" folder and reactivate the old one.

i've had experience with few forum systems, i think PHPBB is much easier and more admin and user friendly.

it will solve lots of problems with image postings and file attachments. all will be much easier and no need for stupid galleries and such.