installing yuidoc under windows 7

I'm trying to get yuidoc running under windows 7... and failing.
Now I'm a nodejs noob so maybe I'm doing something wrong.

I've installed the node-v0.6.19.msi from nodejs.org (got 'hello world' running so that's good)
Then I tried installing yuidoc via npm (as described here http://yui.github.com/yuidoc/)

The npm install seems to work (lots of http GET and no big red ERR!s).
Next I tried 'node yuidoc .' but that throws a 'cannot find module'.

The node msi default install folder is C:\Program Files\nodejs\ while the npm installs yuidoc to C:\Users[username]\AppData\Roaming\npm\node_modules\yuidocjs

Weirdly, the npm install only created some empty folders. What am I doing wrong?
Ah sorry, that was my bad trying to reinstall yuidoc with npm (it errored and cleared the folders).

I now seem to have yuidoc correctly installed (lot's of files in ..node_modules\yuidocjs). But trying to run it from node.js still doesn't work.