When I installed, it defaulted the root where it stores the different versions of Node as "C:\Documents and Settings(my name)\Application Data\nvm". I successfully installed version 0.12.4 through the command prompt, but now when I type "nvm use 0.12.4" it gives an error message: "Exit Status 1: C:\Documents is not recognized as an internal or external command, operable program, or batch file." So I gather that it doesn't like the blank spaces in the root path. I'm going to uninstall NVM and re-install specifying a different root during the install. Is there a different root directory that's generally used with NVM for Windows, or does it really matter, just as long as there are no blank spaces in the path?
Here's an open issue with this problem: https://github.com/coreybutler/nvm-windows/issues/41
looks like it might get fixed soon, but until then, you can solve the problem yourself by editing your settings.txt
root: C:\DOCUME~1\<yourname>\...etc...
path: ...etc...
To get the correct path names without spaces, go to the parent directory and type dir /x (only works in cmd.exe, not powershell.)