Activation context generation failed for "E:\SI\ProArc\Main\Source\Engineering Client\Source\AutoCAD 2012\SI.Integrations.Engg.AutoCAD2012\AutoCAD 2012 - English\acad.exe". Dependent Assembly PPClientAssembly,processorArchitecture="x86",type="x64",version="2008.1.17012.4817" could not be found. Please use sxstrace.exe for detailed diagnosis.
It looks to me like you are trying to start the Acad.exe from a location other than where it was installed. I think you should be starting this from the AutoCAD subdirectory in C:\Program Files\Autodesk unless you have installed this in some other location.