Npm install doesn't work on Windows 10

i have an issue with nodejs. I'm trying to install ember.js library through the command line. When i launch "npm install" command this log appear:

0 info it worked if it ends with ok 1 verbose cli [ 'C:\Program Files\nodejs\\node.exe', 1 verbose cli 'C:\Program Files\nodejs\node_modules\npm\bin\npm-cli.js', 1 verbose cli 'install' ] 2 info using npm@2.11.3 3 info using node@v0.12.7 4 verbose config Skipping project config: C:\Users\Antonio/.npmrc. (matches userconfig) 5 verbose readDependencies loading dependencies from C:\Users\Antonio\package.json 6 error install Couldn't read dependencies 7 verbose stack Error: ENOENT, open 'C:\Users\Antonio\package.json' 7 verbose stack at Error (native) 8 verbose cwd C:\Users\Antonio 9 error Windows_NT 6.3.9600 10 error argv "C:\Program Files\nodejs\\node.exe" "C:\Program Files\nodejs\node_modules\npm\bin\npm-cli.js" "install" 11 error node v0.12.7 12 error npm v2.11.3 13 error path C:\Users\Antonio\package.json 14 error code ENOPACKAGEJSON 15 error errno -4058 16 error package.json ENOENT, open 'C:\Users\Antonio\package.json' 16 error package.json This is most likely not a problem with npm itself. 16 error package.json npm can't find a package.json file in your current directory. 17 verbose exit [ -4058, true ]

I've visited NPM Troubleshooting but i can't found the solution (i tried the three options but nothing happen). Just to say: there is yet a folder named "npm" in AppData/Roaming.