tried upgrade node.js but not succeed,... well?

Code:
Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation.  All rights reserved.

C:\Users\User>node -v
v0.8.16

C:\Users\User>npm cache clean -f

C:\Users\User>npm install -g n
npm http GET https://registry.npmjs.org/n
npm http 200 https://registry.npmjs.org/n
npm http GET https://registry.npmjs.org/n/-/n-1.2.1.tgz
npm http 200 https://registry.npmjs.org/n/-/n-1.2.1.tgz
C:\Users\User\AppData\Roaming\npm\n -> C:\Users\User\AppData\Roaming\npm\node_mo
dules\n\bin\n
n@1.2.1 C:\Users\User\AppData\Roaming\npm\node_modules\n

C:\Users\User>n stable
'bash' is not recognized as an internal or external command,
operable program or batch file.

C:\Users\User>cd C:\Users\User\AppData\Roaming\npm\node_modules\n

C:\Users\User\AppData\Roaming\npm\node_modules\n>n stable
'bash' is not recognized as an internal or external command,
operable program or batch file.

C:\Users\User\AppData\Roaming\npm\node_modules\n>