In your Moo BOINC project folder there are 2 executables. 1 is the stream that was my post that you launch with -bench and the other is the GPU program. I don't know if both are need but I think so.

So, copy those files to ANY directory you can get to from the command prompt and then launch the with stream in the name

dnetc518-win32-x86-stream.exe -bench


There shouldn't be ANY quotes in the command line. If the example I gave originally had them in it then it came from copy/pasting something from the Moo website!