can't use NPM  #19023

#i'm using windows 10, just install node.js latest v9.6.1 and i got this error when trying to use npm
i've tried install and uninstall node several times still got issues

C:\Program Files\nodejs\node_modules\npm\lib\utils\error-handler.js:205
if (npm.config.get('json')) {
^

TypeError: Cannot read property 'get' of undefined
at process.errorHandler (C:\Program Files\nodejs\node_modules\npm\lib\utils\error-handler.js:205:18)
at process.emit (events.js:127:13)
at process._fatalException (bootstrap_node.js:434:26)
5.6.0