Problems in earlier version os plesk

[dreamhawk]

Hello! I have a problem! And i am a newbie at this things!


The general information of the server is:

Plesk server, Microsoft-IIS/7.0, Windows NT MACARICO 6.0 build 6002 (Windows Server 2008 Web Server Edition Service Pack 2) i586,
The database version is 5.1.56-community on mysql.

It belongs to a boys scouts association.

I installed joomla in the server to create a website, and allmost everything works with joomla, except to create menu items. In this case, it gives the imediate message:

Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator, and inform them of the time the error occurred and anything you might have done that may have caused the error.

More information about this error may be available in the server error log.

I have post threads at joomla forum, and to the moment the only "solution" they presented was to check the error log from the server.
I am not the server administrator, just the domain administrator and could not find in any place the error log.

How can i find the error log, not being the server administrator?

Thank you for your time