Iray 3dsmax2011 installation

You will need to have an installed copy of mental ray Standalone 2011.
Copy the following 3 .dll files
cudart.dll
libiraymr.dll
libiray.dll
From: C:\Program Files\Autodesk\mrstand3.8.1-adsk2011\bin
To: C:\Program Files\Autodesk\3ds Max 2011

then download and install this Ctrl.Ghost like this:

mrGeomShaderObject.dlo >3ds Max 2011\plugins

ctrl_ghost_settings.mi > 3ds Max 2011\mentalimages\shaders_autoload\mentalray\include

ctrl_ghost_settings.dll > C:\Program Files\Autodesk\3ds Max 2011\mentalimages\shaders_autoload\mentalray\shaders

Then start 3dsmax2011 and create a basic scene with MentalRay

Create>Geometry>Mental ray> mr Shader then drag the box on the viewport

With mr Geometry Shader box selected go to Modify>Shader>none

then pick Maps>mental ray>Ctrl.Ghost.Settings(ctrl.studio)

then drag it as instance in the MaterialEditor

Progressive rendering > enable > Iray

Max samples > 1000000

Render

Tips:

If it render black, you have a Cuda problem so uou have to disable Cuda. You can do that in the graphic card control panel or by temporary renaming the nvcuda.dll in windows>system32