It's most like a path'ing issue, what does path say in the console.
Talking of path'ing in windows, I use a simpler way to set what version of node to use with what Apps.
I basically copy the node.exe I want, and then inside the same directory I create a simple batch file called setPath.bat
that has this line in it path=%cd%;%path%
This works really well, after opening the console I cd into directory I'm working on, I just call setPath, and then node is pointing at the correct version for the project. This technique allows me to also run different Apps on different Node versions at the same time.
I also have this working as services, different services / website's are using different versions of node, I just use an absolute path to the node version the app requires.