Action not found

Hi everyone!!

I'm developping my own social platform with elgg. I've been working at home (localhost) and it works fine. Now, I want to move this to a server. I've started with original files of elgg (1.7). I have unzipped them, and the DB has been created (it is empty at first). Then, in the "Install Screen" (to fill in the site name, description, url, paths, ...), I click save button and I find this:

Not Found

The requested URL .../public_html/action/systemsettings/install was not found on this server.

 

I think that it is an error in Apache. But I don't know how to solve it. Does anyone have any idea? DB continues empty. And if I try to access to the site, I always see the same "Install Screen", that invokes the same mistake.

Thanks!

Jesus