Well, I faced the same questions 1 hour ago, and I fixed it now.
For the 2 .dll files, you can search the internet to download them, copy them to you directory:C:\Users\dungeon_master\Anaconda3\envs\gl-env\lib\site-packages\graphlab.
In ipython notebook, run import graphlab, and then run graphlab.get_dependencies(). Wait 1 minute, the base package will download.
After the 2 steps, you may restart you computer, then you will find everything back to normal.