Daniel,
> My problem starts when launching Eventum-Setup, here's what I do:
>
> * calling "http://localhost" displays the eventum setup screen
> * I fill out the Eventum setup screen and after clicking START
> INSTALLATION,
> I get the following error:
>
> An Error Was Found
>
> Details: Could not open the file 'include/private_key.php'
> for writing.
> The permissions on the file should be set as to allow the
> user that the
> web server runs as to open it. Please correct this problem
> and try again.
>
Err, as the error message is saying, you need to change the permission
bits on the file /path-to-eventum/include/private_key.php so that the
web server (IIS) is allowed to write to it.
--Joao