1. It looks like you have a permissions issue either on a file or in the registry. If you have a capture tool handy (eg InCtrl5), you could try changing the language options as an admin and see where this is recorded in the system- then apply permissions accordingly.
Alternatively, running the application as admin with the Application Compatibility Toolkit running (comes from Microsoft) will produce a report of where permissions may need enhancing for a standard user.

2. My normal strategy here is to look in the registry, HKCR hive, for the .PRD file association and what the shell/open command specifies. That can lead to a command line solution for installing the PRD files. As I'm not familiar with PRD updates - I'm assuming that they are recognised and installed automatically when you double click them. If this is not the case then I'm talking BS and so ignore this suggestion.

Hi ;
 
    1. As pointed out by EdT it seems issue related to permissions, generally language options can be changed with .ini or .xml files. This information could also be in some HKLM keys. You can use "process monitor" to find where exactly permissions are needed. Launch process monitor in user filtering all but shortcut exe. then check information logged when you try to change language. Here you can find where to apply modify permissions. Permissions can be applied through cacl.exe or subinacl.exe and many other tools

   2. If this is oracle installation patch then you might want to go through this link http://www.akadia.com/services/ora_silent_install.html

       As far as I know .prd are the printer driver related files.

Thanks
I will try process mon to figure the permission issue but what is killing me is applying the patch which has a PRD extension and I can't seem to figure out how to include it as a part of my package as ADI installation is a very manual install with multiple clicks and choosing options etc....

Since you have the basic install sorted out, it would appear that your remaining objective is to include the PRD file installation.
So how do you perform the manual install?

ended up virtualizing the application

Whatever works is the way to go, IMHO.