For example for captcha to work you must have:
GD2 with FreeType to be available to PHP.
Not knowing how you got gd2 installed. It looks like you need to check the GD2 settings again.
Since you did not provide a line item for that on your statement from phpinfo.
You must have missed some steps installing GD2
Bear in mind like Gizmo stated. Most all sites have GD2 pre-installed by there host so it is not a issue.
Usually it is ImageMagick that people try to use which is not installed and even then they don't know the paths.
