Having trouble uninstalling Post-Nuke [moved]

Ancient Nix

Sep 10, 2006
Hello I recently tried to uninstall Post-Nuke from Cpanel however it states that I first need to Prepare Post-Nuke for Removal by clicking this button. It comes up, "Warning: shell_exec() has been disabled for security reasons in /home/rsauxil/public_html/prepare_removal.php on line 22" Would this be with my firewalls on my computer, the server's firewalls or something other than that? I did download Post-Nuke into my root directory of my website.