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OK turns out my host had installed PHP5 but to prevent broken installs for people who have plugins and isntalls which use PHP4 so it has to be specifically invoked with the .htaccess file using the following two lines added to the domain root .htaccess file:
AddHandler application/x-httpd-php5 .php
AddType application/x-httpd-php5 .php
And upload the .htaccess file to your server.
NOTE: back up the .htacess file on your server first rename it old.htaccess or something like that, then upload new one, then if something goes wrong it’s an eays fix.
CHECK WITH YOUR HOSTS FIRST.
Don’t make changes unlkess you are certain you can undo them, I’m not repsonsible for broken installs just telling you for info only. But many hosts are doing this this way.