Hi everyone.
This helped me and may help some of you. Dot net has a check to restrict the use of cyptographic algorithms to those that are FIPS evaluated. Launcher.exe uses a hashing algorithm (IIRC) that is not FIPS approved. This immediately throws an exception if this check is enabled on your computer. You won't even get to the yellow logo that first comes up.
Note that this check will have to be reapplied if you validate using steam ect. I have not checked in to the details of this check so I don't know how to disable it system wide, etc.
http://blogs.msdn.com/b/shawnfa/arch...thm-check.aspx