I DLed and ran opencv-3.0.0-rc1.exe, now what?

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I'm a total noob to openCV. I downloaded opencv-3.0.0-rc1.exe and ran it. I think it finished cleanly. I see a build directory and a sources directory. I had a look here:

http://docs.opencv.org/doc/tutorials/...

but it just says, in step 4 at the top, to check the install at some path that ends with "Builds...". I can't find that. I'm in Win 7. Maybe I needed to run as admin? I don't even really know what this should look like when it's installed. I was assuming I'd be able to install it and then do "import openCV" in my current python installation (python 3.3.3).

I just want to write a simple compositing script that will lay 1 image sequence over another.

Any help appreciated!