I don't know why isn't working for me. I opened powershell as administrator and run npm install -g @vue/cli. I have done uninstalling vue-cli and restalling again doesn't work. Here is my error
PS C:\WINDOWS\system32> npm install -g @vue/cli
npm WARN deprecated cross-spawn-async@2.2.5: cross-spawn no longer requires a build toolchain, use it instead
C:\Users\Lin Aung\AppData\Roaming\npm\vue -> C:\Users\Lin Aung\AppData\Roaming\npm\node_modules\@vue\cli\bin\vue.js
> protobufjs@6.8.8 postinstall C:\Users\Lin Aung\AppData\Roaming\npm\node_modules\@vue\cli\node_modules\protobufjs
> node scripts/postinstall
> nodemon@1.18.10 postinstall C:\Users\Lin Aung\AppData\Roaming\npm\node_modules\@vue\cli\node_modules\nodemon
> node bin/postinstall || exit 0
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.2.7 (node_modules\@vue\cli\node_modules\fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.2.7: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"})
+ @vue/cli@3.5.0
added 680 packages from 509 contributors in 172.749s
PS C:\WINDOWS\system32> vue
vue : The term 'vue' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again.
At line:1 char:1
+ vue
+ ~~~
+ CategoryInfo : ObjectNotFound: (vue:String) [], CommandNotFoundException
+ FullyQualifiedErrorId : CommandNotFoundException
PS C:\WINDOWS\system32>
Adding %APPDATA%\npm to the PATH fixed my problem