234578 PHP upgrade

Need to upgrade from PHP Version 5.0.4 to PHP 5.2.6 on linux server running Plesk 8.4. Also repair and upgrade to latest -DNS Server (BIND) not working. see error mesages below. Unable to make action: Unable to manage service by dnsmng: dnsmng: Service /etc/init.d/named failed to start -------------------------------------------------------------------------------- 0: /usr/local/psa/admin/plib/[login to view URL] psaerror(string 'Unable to make action: Unable to manage service by dnsmng: dnsmng: Service /etc/init.d/named failed to start') 1: /usr/local/psa/admin/htdocs/server/[login to view URL] require(string '/usr/local/psa/admin/htdocs/server/[login to view URL]') 2: /usr/local/psa/admin/htdocs/[login to view URL] The server is running multiple script at the moment and need all current setting intact.