Fixed: After doing some more research I was able to successfully get to login. Here's what I checked and did, perhaps this will work for you:
-As the guide says, ensure the HB.exe is in the same folder as your wow directory.
-Ensure the settings are correct for your OS. I.E I use Windows 8 so the game runs on Dx11, windowed mode and as a 32 bit client (i'm using 64 bit os).
-The game HAS to be started before starting HB.
-Ensure both .NET framework and your C++ are up to date. Here is a link to the current C++
Download Microsoft Visual C++ 2010 Redistributable Package (x86) from Official Microsoft Download Center
Not saying that this WILL work for you however I had the same issue as you and it's now working. Good luck!