0xc000007b means "STATUS_INVALID_IMAGE_FORMAT" (MSDN troubleshooting page) and in GMLive's case would probably mean that you have a 64-bit C++ runtime redistributable package, or related dependencies.
If it proves too tricky to figure out using the guide, shoot me an email from your purchase email address - I recently started building .NET based versions of gmlive-server for people that couldn't get it working in a normal way.