问在Windows 7中未安装angular-cli

EN

C:\>npm install -g angular-cli
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" "angular-cli"
npm ERR! node v7.4.0
npm ERR! npm  v4.0.5

npm ERR! Cannot read property 'path' of null
npm ERR!
npm ERR! If you need help, you may report this error at:
npm ERR!     <https://github.com/npm/npm/issues>
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" "angular-cli"
npm ERR! node v7.4.0
npm ERR! npm  v4.0.5
npm ERR! code ECONNRESET

npm ERR! network socket hang up
npm ERR! network This is most likely not a problem with npm itself
npm ERR! network and is related to network connectivity.
npm ERR! network In most cases you are behind a proxy or have bad network setti
gs.
npm ERR! network
npm ERR! network If you are behind a proxy, please make sure that the
npm ERR! network 'proxy' config is set properly.  See: 'npm help config'
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" "angular-cli"
npm ERR! node v7.4.0
npm ERR! npm  v4.0.5
npm ERR! path C:\npm-debug.log.928650742
npm ERR! code EPERM
npm ERR! errno -4048
npm ERR! syscall open

npm ERR! Error: EPERM: operation not permitted, open 'C:\npm-debug.log.92865074
'
npm ERR!  { Error: EPERM: operation not permitted, open 'C:\npm-debug.log.92865
742'
npm ERR!   errno: -4048,
npm ERR!   code: 'EPERM',
npm ERR!   syscall: 'open',
npm ERR!   path: 'C:\\npm-debug.log.928650742' }
npm ERR!
npm ERR! Please try running this command again as root/Administrator.

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

C:\>