ALso make sure the default .htaccess file is in the root of the software.
makes sure .htaccess is in the root of the software and has default content
mod_rewrite should be enabled and CONFIGURED PROPERLY
And after loading via index.php you get 500.php error, change your home uri and ask your hosting to properly configure mod_rewrite as it conflicts with our .htaccess file.
Comme dit ross, il faut vérifier le htaccess et que le mod_rewrite est bien fonctionnel...
(Just a proposal to speak about that in the french forum, or to help via PM)
I don't know if Oxwall can run on it...
It use IIS Mod-Rewrite so maybe there are some incompatibilities