我在使用npm时遇到问题，无法安装任何程序。这是错误消息：

C:\Windows\system32>npm install -g yo
npm http GET https://registry.npmjs.org/yo
npm http GET https://registry.npmjs.org/yo
npm http GET https://registry.npmjs.org/yo
npm ERR! network read ECONNRESET
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 settin
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! System Windows_NT 6.2.9200
npm ERR! command "C:\\Program Files\\nodejs\\\\node.exe" "C:\\Program Files\\nod
ejs\\node_modules\\npm\\bin\\npm-cli.js" "install" "-g" "yo"
npm ERR! cwd C:\Windows\system32
npm ERR! node -v v0.10.17
npm ERR! npm -v 1.3.8
npm ERR! syscall read
npm ERR! code ECONNRESET
npm ERR! errno ECONNRESET
npm ERR!
npm ERR! Additional logging details can be found in:
npm ERR!     C:\Windows\system32\npm-debug.log
npm ERR! not ok code 0

知道为什么吗？这是我的网络设置，似乎我没有配置任何代理。我还禁用了所有防火墙。