Very Sleepy Profiler

I stumbled across Richard Mitton's awesome free profiler for MSVC, Very Sleepy.

Install, and compile your program with debug information, run the profiler, select your process and thread, and sample away!

Amazing! The best tool ever, couldn't be easier and does exactly what I want.

As you can see from the screenshot, it will even take you straight to the code you need to spend some time optimizing. Nifty.