None of this disabled functions will prevent you from installing
Joomla. You will need to disable mod_security from your .htaccess file in public_html directory and then proceed with the installation.
Once you find everything properly set then remove the mod_security code from .htaccess.
here's the code you need to put in your .htaccess file to disable mod_security :-
PHP Code:
<IfModule mod_security.c>
SecFilterEngine Off
SecFilterScanPOST Off
</IfModule>