Maya wrong renderer

Hey guys,
im having a problem with Maya 2010 and the maya rendrer. My problem is looking hard too fix... My layers passes is set to maya software renderer in the render settings. But when im rendering in command line with the render.exe, i force in the command line to render with the flag -r sw, but it still render in mental ray. Log :

>"C:\Program Files\Autodesk\Maya2010\bin\Render.exe" -proj "\\192.168.xxxxxxxxxxxxxxxxxxx_Scene" -r sw -rd "\\192.168.2.6\xxxxxxxxxya_Scene\images\xxxxxxx_R" -im "xxxxxxxxxxx_R" -s 1561 -e 1561 -b 1 -rfs 1561 -rfb 1 -cam "stereoCameraRightShape" -rl "amb" -pad 4 -of "tga" -fnc "name.#.ext" "\\192.168xxxxxxxx\scenes\BG\SC06A\xxxxxx_R.mb"

Starting "C:\Program Files\Autodesk\Maya2010\bin\mayabatch.exe"
mental ray for Maya 2010
// mental ray for Maya: using startup file C:/Program Files/Autodesk/Maya2010/mentalray/maya.rayrc
mental ray for Maya: setup
mental ray for Maya: initialize
mental ray: version 3.7.53.5, Jun 17 2009, revision 88216
mental ray for Maya: using 1 license
mental ray for Maya: register extensions
// mental ray Node Factory: loaded
mental ray for Maya: successfully registered
mental ray for Maya: loading startup file: C:/Program Files/Autodesk/Maya2010/mentalray/maya.rayrc
// parsing C:/Program Files/Autodesk/Maya2010/mentalray/include/AdskShaderSDKWrappers.mi
// generating Maya nodes...
// parsing C:/Program Files/Autodesk/Maya2010/mentalray/include/architectural.mi
// loading C:/Program Files/Autodesk/Maya2010/mentalray/lib/architectural.dll
// generating Maya nodes...
// parsing C:/Program Files/Autodesk/Maya2010/mentalray/include/base.mi
// loading C:/Program Files/Autodesk/Maya2010/mentalray/lib/base.dll
// generating Maya nodes...
// parsing C:/Program Files/Autodesk/Maya2010/mentalray/include/contour.mi
// loading C:/Program Files/Autodesk/Maya2010/mentalray/lib/contour.dll
// generating Maya nodes...
// parsing C:/Program Files/Autodesk/Maya2010/mentalray/include/paint.mi
// loading C:/Program Files/Autodesk/Maya2010/mentalray/lib/paint.dll
// generating Maya nodes...
// parsing C:/Program Files/Autodesk/Maya2010/mentalray/include/physics.mi
// loading C:/Program Files/Autodesk/Maya2010/mentalray/lib/physics.dll
// generating Maya nodes...
// parsing C:/Program Files/Autodesk/Maya2010/mentalray/include/production.mi
// loading C:/Program Files/Autodesk/Maya2010/mentalray/lib/production.dll
// generating Maya nodes...
// parsing C:/Program Files/Autodesk/Maya2010/mentalray/include/subsurface.mi
// loading C:/Program Files/Autodesk/Maya2010/mentalray/lib/subsurface.dll
// generating Maya nodes...
// parsing C:/Program Files/Autodesk/Maya2010/mentalray/include/surfaceSampler.mi
// loading C:/Program Files/Autodesk/Maya2010/mentalray/lib/surfaceSampler.dll
// generating Maya nodes...
Error: line 1: Plug-in, "RenderMan_for_Maya.mll", was not found on MAYA_PLUG_IN_PATH.
Warning: line 1: Unrecognized node type for node 'renderManGlobals'; preserving node information during this session.
Warning: line 1: Unrecognized node type for node 'rmanFinalGlobals'; preserving node information during this session.
Warning: line 1: Unrecognized node type for node 'rmanFinalOutputGlobals0'; preserving node information during this session.
Warning: line 1: Unrecognized node type for node 'vectorRenderGlobals'; preserving node information during this session.
File read in 62 seconds.
Result: //xxxxxxxxxxaba_Maya_Scene/scenes/BG/SC06A/xxxxx_R.mb




Any ideas how i can fix that ?
i can see after the scene is opened, a log writing requires "maya_to_mr" plugins... something like that.
i saved my scene in binary, no chance.

thanks