Windows
Troubleshooting Meteor on Windows
Can't start Mongo server
If your embed MongoDB is not starting when you run meteor and you see messages like these:
C:\Users\user\app> meteor
=> Started proxy.
Unexpected mongo exit code 3221225781. Restarting.
Unexpected mongo exit code 3221225781. Restarting.
Unexpected mongo exit code 3221225781. Restarting.
Can't start Mongo server.
You probably need to install Visual C++ Redistributable for Visual Studio 2015.
Download it here and install.
After installing vc_redist.x64 you should be able to run Meteor and MongoDB server without problems.