vagrant ssh doesn't work on windows because of path issues. Although you can update some files to fix this, running PuTTY is slightly more accessible (and has a GUI configuration screen to fill in).
By the end of this lesson you will be able to SSH into a remote machine using PuTTY.
You can log into your Vagrant machine using PuTTY with the IP address listed from running the command vagrant ssh in the same directory as your Vagrantfile.