Unable to launch android emulator

I'm just trying out Titanium, and am trying to get the hello world app running on an android emulator, but with no luck. I get the below output when running the app. I have followed a suggestion on another post here to comment out that line, which I did. But then nothing happens when I try to run the app. I am not getting any other console output at all, not on the studio console, nowhere.

[ERROR] Application Installer abnormal process termination. Process exit value was 8
C:\Users\mcassidy\AppData\Roaming\npm\node_modules\titanium\node_modules\longjohn\dist\longjohn.js:185
        throw e;
              ^
TypeError: Bad argument
    at ChildProcess.spawn (child_process.js:946:24)
    at exports.spawn (child_process.js:746:9)
    at async.parallel.powershell (C:\ProgramData\Titanium\mobilesdk\win32\3.5.0.GA\node_modules\titanium-sdk\lib\windows.js:385:14)
    at C:\ProgramData\Titanium\mobilesdk\win32\3.5.0.GA\node_modules\async\lib\async.js:524:25
    at C:\ProgramData\Titanium\mobilesdk\win32\3.5.0.GA\node_modules\async\lib\async.js:111:13
    at Array.forEach (native)
    at _each (C:\ProgramData\Titanium\mobilesdk\win32\3.5.0.GA\node_modules\async\lib\async.js:32:24)
    at async.each (C:\ProgramData\Titanium\mobilesdk\win32\3.5.0.GA\node_modules\async\lib\async.js:110:9)
    at _parallel (C:\ProgramData\Titanium\mobilesdk\win32\3.5.0.GA\node_modules\async\lib\async.js:523:20)
    at async.parallel (C:\ProgramData\Titanium\mobilesdk\win32\3.5.0.GA\node_modules\async\lib\async.js:539:9)