Error when trying to install SASS module for Grunt

Yesterday everything was working, today it isn't, I don't think it is module problem, but something with my computer, because I was cleaning files (though I don't remember removing something releated with Node.JS), so I'm writing this there, instead of GitHub. I've tried to reinstalling Node, but nothing helps.

I am using Windows 8.1, 64bit, and this is error log after trying to install grunt-sass:

> node build.js


module.js:340
    throw err;
          ^
Error: Cannot find module 'C:\build.js'
    at Function.Module._resolveFilename (module.js:338:15)
    at Function.Module._load (module.js:280:25)
    at Function.Module.runMain (module.js:497:10)
    at startup (node.js:119:16)
    at node.js:906:3

npm ERR! node-sass@0.9.5-rc1 install: `node build.js`
npm ERR! Exit status 8
npm ERR!
npm ERR! Failed at the node-sass@0.9.5-rc1 install script.
npm ERR! This is most likely a problem with the node-sass package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR!     node build.js
npm ERR! You can get their info via:
npm ERR!     npm owner ls node-sass
npm ERR! There is likely additional logging output above.
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" "gulp-sass" "--save-dev"
npm ERR! cwd C:\XAMPP\htdocs\files
npm ERR! node -v v0.10.32
npm ERR! npm -v 1.4.28
npm ERR! code ELIFECYCLE
npm ERR! not ok code 0

I know there is Cannot find module 'C:\build.js', before reinstalling Node installation path was C:\Node.JS, not C:\.