PROBLEM Admin 404

[smdp-1971]

I am unable to resolve this problem.
I have a fresh install where I can add new pages and edit them, the redirect 404 only happens with the index page when i try to update or change the text there, or add an image to the new page.


I see this in the in the browser address bar.

/admin/changedata.php

And this is what the page shows.

Oops! Page not found!

We are sorry, but the page you are looking for does not exist.

I could really do with some help or advise on on this!

Probably the problem in mod_security. Contact your hosting to remove the mod_security rules for the domain you have.