My machine runs Windows Vista SP1.
During the installation process I was prompt with a warning message that the Machine Debug Manager service was still running. For completing the installation process on the safe side I had to stop this service.
So, what is exactly the Machine Debug Manager? What is the purpose of it?
Machine Debug Manager supports local and remote debugging for Visual Studio and script debuggers. Among these, it also allows windows users to debug Internet Explorer scripting errors.
You can stop this service by opening Windows Services (start --> run --> services.msc) and explicitly stopping the service "Machine Debug Manager" (Service Name: MDM).
When the installation of the Service Pack completes, you can then start the service again if desirable.