Answer summary. Thanks all for the replies. This helped a lot for our IT staff.
You are correct. Your Advanced Rendering Extension must be added as a floating module, or you must configure your .PSF files to launch it with ProE.
We had ARX at my last job. It is really just a modified photorender. You get more options when setting up a scene and it uses a different render engine. If I remember it was 2-3 times faster than the standard photorender.
i think you need to install that option from the disc , you will get the photo lux option as a render Steve Burke CAD Engineering Services
ProPhotorender is certainly different to the Advanced Rendering Extension. The Advanced Rendering Extension will give you Photolux.
Firstly I would suggest checking that the ARX license has been obtained (maybe it is a floating option or something).
Secondly open up the Rendering Setup Dialog and check the renderer option. This should say Photolux not Photorender.