node-gyp: node-gyp failing on Windows x64

npm install bcrypt
> bcrypt@0.7.1 install D:\Users\Sean\Documents\Mozilla\browserid\node_modules\bcrypt
> node-gyp rebuild


D:\Users\Sean\Documents\Mozilla\browserid\node_modules\bcrypt>node "C:\Program F
iles\nodejs\node_modules\npm\bin\node-gyp-bin\\..\..\node_modules\node-gyp\bin\n
ode-gyp.js" rebuild
C:\Program Files (x86)\MSBuild\Microsoft.Cpp\v4.0\Microsoft.Cpp.InvalidPlatform
.Targets(23,7): error MSB8007: The Platform for project 'bcrypt_lib.vcxproj' is
 invalid.  Platform='x64'. You may be seeing this message because you are tryin
g to build a project without a solution file, and have specified a non-default
Platform that doesn't exist for this project. [D:\Users\Sean\Documents\Mozilla\
browserid\node_modules\bcrypt\build\bcrypt_lib.vcxproj]
gyp ERR! build error
gyp ERR! stack Error: `msbuild` failed with exit code: 1
gyp ERR! stack     at ChildProcess.onExit (C:\Program Files\nodejs\node_modules\
npm\node_modules\node-gyp\lib\build.js:236:23)
gyp ERR! stack     at ChildProcess.EventEmitter.emit (events.js:96:17)
gyp ERR! stack     at Process._handle.onexit (child_process.js:678:10)
gyp ERR! System Windows_NT 6.1.7600
gyp ERR! command "node" "C:\\Program Files\\nodejs\\node_modules\\npm\\node_modu
les\\node-gyp\\bin\\node-gyp.js" "rebuild"
gyp ERR! cwd D:\Users\Sean\Documents\Mozilla\browserid\node_modules\bcrypt
gyp ERR! node -v v0.8.12
gyp ERR! node-gyp -v v0.7.0
gyp ERR! not ok
npm ERR! bcrypt@0.7.1 install: `node-gyp rebuild`
npm ERR! `cmd "/c" "node-gyp rebuild"` failed with 1
npm ERR!
npm ERR! Failed at the bcrypt@0.7.1 install script.
npm ERR! This is most likely a problem with the bcrypt package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR!     node-gyp rebuild
npm ERR! You can get their info via:
npm ERR!     npm owner ls bcrypt
npm ERR! There is likely additional logging output above.

npm ERR! System Windows_NT 6.1.7600
npm ERR! command "C:\\Program Files\\nodejs\\\\node.exe" "C:\\Program Files\\nod
ejs\\node_modules\\npm\\bin\\npm-cli.js" "install" "bcrypt"
npm ERR! cwd D:\Users\Sean\Documents\Mozilla\browserid
npm ERR! node -v v0.8.12
npm ERR! npm -v 1.1.63
npm ERR! code ELIFECYCLE
npm ERR!
npm ERR! Additional logging details can be found in:
npm ERR!     D:\Users\Sean\Documents\Mozilla\browserid\npm-debug.log
npm ERR! not ok code 0