Ionic -npm install -g cordova ionic Problem installing

Hi, I’m having a trouble installing cordova and ionic please help

C:\Users\mj>npm install -g cordova ionic
npm ERR! not a package C:\Users\mj\cordova
npm ERR! addLocal Could not install C:\Users\mj\cordova
npm ERR! Windows_NT 6.1.7601
npm ERR! argv “C:\Program Files\nodejs\node.exe” “C:\Program Files\nodejs\
node_modules\npm\bin\npm-cli.js” “install” “-g” “cordova” "ionic"
npm ERR! node v4.2.1
npm ERR! npm v2.14.7
npm ERR! path C:\Users\mj\AppData\Local\Temp\npm-15840-cd93d1e6\unpack-b0ffd
npm ERR! code ENOENT
npm ERR! errno -4058
npm ERR! syscall open

npm ERR! enoent ENOENT: no such file or directory, open 'C:\Users\mj\AppData
npm ERR! enoent This is most likely not a problem with npm itself
npm ERR! enoent and is related to npm not being able to find a file.
npm ERR! enoent

npm ERR! Please include the following file with any support request:
npm ERR! C:\Users\mj\npm-debug.log