I just installed Node.js on my Windows 7 machine, added it to the PATH and tried to use it. npm works perfectly (at least for now) and node --version prints v4.1.2. 
However, when I try to execute another command like node update it appends the command to the current working directory and, of course, fails : 
$ node help
module.js:338
    throw err;
    ^
Error: Cannot find module 'c:\path\to\working\directory\help'
    at Function.Module._resolveFilename (module.js:336:15)
    at Function.Module._load (module.js:286:25)
    at Function.Module.runMain (module.js:475:10)
    at startup (node.js:118:18)
    at node.js:952:3
What can I do?
