Diagnostic Policy Service
Windows Vista Service Details
Annoying app that verifies all your programs installed correctly. Well that is just my take on it. It is a collection of diagnostic tools that attempts to detect problems in memory, disk, and files.
Enables detection of problems, troubleshooting, and problem resolution for Windows components. If the service is stopped, diagnostics will no longer function.
Consequences of Stopping:
All services listed in 'Required For' will be unable to function