Where are the OpenCV prebuilt dlls?

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I've downloaded OpenCV from here:

http://sourceforge.net/projects/opencvlibrary/files/opencv-win/

This gave me and exe. When run it expanded into a bunch of folders and files.

Then I followed the instructions for installing on windows:

http://docs.opencv.org/doc/tutorials/introduction/windows_install/windows_install.html#windows-installation

The above instructions say there should be a "bin" folder, and they also say to start and follow the "set up wizard".

I don't have a bin file or a "setup" program to run. It seems like I probably just have the source files. I've googled around and most blogs, websites etc all point to the SourceForge download folder that I used.

Is there another place to get the pre built dlls. Or does everyone end up building them?

Thanks,

Mitch