whay I cant use npm commant ?

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Node.js

Hi I install nodejs !
But it dont create the node_modules in %HOMEDRIVE%%HOMEPATH% and I can run eny command !
for EX:

C:\Windows\system32>npm link
npm ERR! Error: ENOENT, open 'C:\Windows\system32\package.json'
npm ERR! If you need help, you may report this *entire* log,
npm ERR! including the npm and node versions, at:
npm ERR!     <http://github.com/npm/npm/issues>

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" "link"
npm ERR! cwd C:\Windows\system32
npm ERR! node -v v0.10.33
npm ERR! npm -v 1.4.28
npm ERR! path C:\Windows\system32\package.json
npm ERR! code ENOENT
npm ERR! errno 34
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