Hi,first, sorry for my bad english.
Yesterday, I logged in my altervista panel, and zenphoto notified me the upgrade, so I installed it but after this message shows up when I try to log in the admin panel

A corrupt configuration file was detected. You should remove or repair the file and re-run setup.

Please let me now what can I do. Thank you

Re-install Zenphoto and re-run setup as described on our installation instructions.

Ok, and about all my albums and photos?

Another problem is that the same error occurs when I try to go in the administration panel..

Your albums will not be harmed if you follow the instructions. To be sure these:
http://www.zenphoto.org/news/installation-and-upgrading/#upgrading