A child being immunized against polio. Immunization, or immunisation, is the process by which an individual's immune system becomes fortified against an agent (known as the immunogen). When this system is exposed to molecules that are foreign to the body, called non-self, it will orchestrate an immune response, and it will also develop the ability to quickly respond to a subsequent encounter because of immunological memory.
Windows Audio Device Graph Isolation is an audio file for recent versions of Windows that prevents other applications from modifying audio-related content and plug-ins. The application also serves as the audio engine for Windows.
In the file version information, audiodg.exe is described as Windows Audio Device Graph Isolation. This process first appeared in Windows as non-critical component of the audio subsystem. You can find it running in the Task Manager be default. Therefore, it is not malware or spyware.