npm ERR! Protocol "https:" not supported. Expected "http:"

[Itacolomy]

Srs, boa noite!, Novato em Ionic, estou tentando instalar o programa em meu note sob a plataforma Windows 10 64x.
C:\Users\Mariano>node -v
v4.2.1
C:\Users\Mariano>npm -v
2.14.7

Usando os comandos:
npm install -g ionic@beta OU npm install -g cordova ionic

O sistema está retornando a seguinte mensagem:

C:\Users\Mariano>npm install -g cordova ionic
npm ERR! Windows_NT 10.0.14393
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! Protocol "https:" not supported. Expected "http:".
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 10.0.14393
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! Protocol "https:" not supported. Expected "http:".
npm ERR!
npm ERR! If you need help, you may report this error at:
npm ERR! https://github.com/npm/npm/issues

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

C:\Users\Mariano>

ALGUÉM PODE INFORMAR QUAL PROCEDIMENTO DEVO ADOTAR PARA SOLUCIONAR ESTE PROBLEMA?