(updated based on the fact that you're using Windows 8.1)
Windows 8.1 came with some changes to the underlying system that the VS profiler uses when collecting information. If you update to Visual Studio 2012 Update 4 (or newer) and profile again, symbols should be resolved correctly.
Generally, in the VS Profiler, when you see module names in square brackets where you would expect function names, it means that symbols for that module could not be resolved.