javascript - Node.js- "npm install express" error:0906D06C :PEM routines : PEM_read_bio npm -

i have installed node.js , has npm installed along it. in windows command prompt,when write "npm install express", gives me following error.how resolve this?

c:\users>npm -v

2.11.2

c:\users>npm install express

npm err! windows_nt 6.1.7601

npm err! argv "c:\program files\nodejs\\node.exe" "c:\program files\nodejs \node_modules\npm\bin\npm-cli.js" "install" "express"

npm err! node v0.12.5

npm err! npm v2.11.2

npm err! error:0906d06c:pem routines:pem_read_bio:no start line

npm err!

npm err! if need help, may report error at: npm err!
https://github.com/npm/npm/issues

npm err! please include following file support request: npm err! c:\users\npm-debug.log