Get Calibre.
Download DRM removal tools zip file.
Open Calibre, Ctrl-p for preference. Click Plugins under Advanced, click "Load plugin from file" button. Choose file from the unzipped tools. Bypass security warning, success!
Kindle books are generally stored here: C:\Users$$!Your Windows Username]\Documents\My Kindle Content
Drag azw format files into Calibre, right click convert file to any format.
All thanks to howotogeek.com:
I did not get all my kindle books converted, which I believe has something to do with serial numbers, etc. (the comments may have some helpful hints on this). In the mean time, I have successfully converted some of my more important books and I'm good for now.