Migrating Octopress to a New Computer

Yesterday, I decided to pull the trigger on updating to Windows 8.1. It went smoothly, but I couldn't seem to get Octopress working for me. Luckily, Daniel Auger posted a quick snippet (originally posted by @dlobckdotorg) on how to get back up and running. If you're moving Octopress to a new computer, make sure you save that post! Just in case either of their sites go away, I've reproduced it as a Gist here: https://gist.github.com/s992/23d35ebad8e8988c02c5