With a properly configured server, it shouldn't be possible for someone to change your settings.php file.

You don't mention the version of Elgg that you are using.

I believe you should only see the first install page if there is not a settings.php file in the engine directory or the web server does not have permission to read it.

I am using version 1.7.  The settings.php is in the engine directory, and im getting the install page.  How can I see if my server is not reading it?  Also, if I do fill in the install page again, does that mean all data is lost?  Thanks.

nm, fixed it!  thanks

You might have been getting to many hits to your database,and the elgg page will tell you your user creditials aren't correct.I changed that in the  lang. file to say mysite.com is temorarily unavailable,we'll be back soon.