When you go into Admin / Diagnostics and get the output from phpinfo, is that the path of the php.ini it’s loading?
Sometimes there is more than one php.ini in one system.
Another thing, are you sure you don’t have any other errors in your logs? In both suitecrm.log and your web server log:
https://stackoverflow.com/questions/19713001/where-can-i-find-the-wamp-error-log