Erro npm install -g @angular/[email protected]

C:\WINDOWS\system32>npm install -g @angular/cli@6.0.7
npm WARN deprecated request@2.88.2: request has been deprecated, see https://github.com/request/request/issues/3142
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.2.11 (node_modules\@angular\cli\node_modules\fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.2.11: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"})

npm ERR! code EEXIST
npm ERR! path C:\Users\Siqueira\AppData\Roaming\npm\node_modules\@angular\cli\bin\ng
npm ERR! dest C:\Users\Siqueira\AppData\Roaming\npm\ng
npm ERR! EEXIST: file already exists, cmd shim 'C:\Users\Siqueira\AppData\Roaming\npm\node_modules\@angular\cli\bin\ng' -> 'C:\Users\Siqueira\AppData\Roaming\npm\ng'
npm ERR! File exists: C:\Users\Siqueira\AppData\Roaming\npm\ng
npm ERR! Remove the existing file and try again, or run npm
npm ERR! with --force to overwrite files recklessly.

npm ERR! A complete log of this run can be found in:
npm ERR!     C:\Users\Siqueira\AppData\Roaming\npm-cache\_logs\2020-02-13T22_15_29_967Z-debug.log