I installed zenphoto..
when i go to zen/setup.php i see this:
[b]
database connected
We're all set to create the database tables: myphotos_albums, myphotos_images, and myphotos_comments.
Go![/b]

when i hit GO! i see this:

[b]Creating tables...
Done!
You can now View your gallery, or administrate.
[/b]

when i hit VIEW YOUR GALLERY i get :

a default browser [b]INDEX OF /ZENPHOTO[/b]

and when i hit ADMINISTRATE i do get the admin page, but when i name a new gallery, select an image and hit UPLOAD, i get this:

[b]Warning: mkdir() [function.mkdir]: Permission denied in /usr301/home/b/u/bulle/public_html/zenphoto/zen/admin.php on line 67

Warning: chmod() [function.chmod]: No such file or directory in /usr301/home/b/u/bulle/public_html/zenphoto/zen/admin.php on line 69

Warning: move_uploaded_file(/usr301/home/b/u/bulle/public_html/zenphoto/albums/houston/houston1.jpg) [function.move-uploaded-file]: failed to open stream: No such file or directory in /usr301/home/b/u/bulle/public_html/zenphoto/zen/admin.php on line 79

Warning: move_uploaded_file() [function.move-uploaded-file]: Unable to move '/var/tmp/phpEeztuc' to '/usr301/home/b/u/bulle/public_html/zenphoto/albums/houston/houston1.jpg' in /usr301/home/b/u/bulle/public_html/zenphoto/zen/admin.php on line 79
/usr301/home/b/u/bulle/public_html/zenphoto/albums/houston
Album houston does not exist.[/b]

can anyone help me with this?

Yep. Wrong permissions on albums folder. You have to somehow give it read/write permissions (chmod 777). Do the same to the cache folder.

Can you get to your gallery by manually going to "[www.yoursite.com]/zenphoto" ? If you still get a directory index, you might need to contact your host and ask them to add index.php as a defaultly displaying page for the server.