Just some notes for others on my resolved R2B3 Windows install issues. I followed the installation procedures for Windows Binary Release - https://github.com/ros2/ros2/wiki/Windows-Install-Binary.
After install, running c:\dev\ros2\local_setup.bat failed and reported that it couldn’t find a file. Turns out it expects python to be in c:\Python36, when it was actually installed in c:\program files\python36. The path is hard coded in the root local_setup.bat, where you must change it to the correct install directory.
Running the local_setup.bat now works, feeling pretty good, until I tried to run the demo_nodes example. Immediately fails with “Failed to create process”. Make sure there is no space in your python path. I spent way too much time figuring that one out…
One quick test: after running local_setup.bat, if you just try to run ros2 with no args, and it reports “Failed to create process”, it’s most likely due to a space in the python path.