Here is my mongod.cfg file:
mongod.cfg
bind_ip = 127.0.0.1 dbpath = C:\\mongodb\\data\\db logpath = C:\\mongodb\\log\\mongo-server.log verbose=v
Point to your mongodb instalation e.g C:\Program Files\MongoDB\Serve\bin and run mongod.exe so you can open connection to 127.0.0.1:27017.