We got the core issue resolved, but there is still some issue on the bitness making some sites with PHP not load, and trying to resolve this is an odd one.
At least not is it only those loading PHP and not all sites in the pools.
Attempting a reinstall of the FastCGI services, as nothing else seems to work, we got the crashing fixed, we got the bitness matter fixed, but php sites are still saying that FastCgiModule doesn't exist now.
The reinstall did not work as it failed to uninstall so it was not possible to 'reinstall' however all but PHP has been up since a few moments after the last post.