From: "Rich Gauszka" 


"Geo."  wrote in message news:4591cefe{at}w3.nls.net...
> "Rich"  wrote in message news:4591af71$1{at}w3.nls.net...
>>>   Feel free to do what you say you do already and start turning off
>>> random services and deleting random files.  If you don't break your
>>> system you may end up closer to whatever it is that you believe you
>>> want.<<
>
> Quick question, what are
> Diagnostic Policy Service
> and
> Diagnostic system host ?
>
> Geo.

They both appear to enable Vista's problem resolution/diagnostics
http://technet.microsoft.com/en-us/windowsvista/aa905076.aspx
If it's necessary to launch a full-fledged diagnostic scenario through
problem detection or the on-demand mechanism, the Diagnostic Policy Service
(DPS) comes into play, handing the scenario in sequence to various
diagnostic modules for problem detection, troubleshooting, and resolution.
These diagnostic modules encode domain-specific knowledge, such as how to
find the root cause of a performance problem. The DPS may invoke a
troubleshooter, which is an executable that uses the event data and system
state to try to identify the root cause of the problem.

http://www.msfn.org/board/lofiversion/index.php/t86648.html

Diagnostic System Host
The Diagnostic System Host service enables problem detection,
troubleshooting and resolution for Windows components. If this service is
stopped, some diagnostics will no longer function. If this service is
disabled, any services that explicitly depend on it will fail to start.

Diagnostic Policy Service
The Diagnostic Policy Service enables problem detection, troubleshooting
and resolution for Windows components. If this service is stopped,
diagnostics will no longer function. If this service is disabled, any
services that explicitly depend on it will fail to start.

--- BBBS/NT v4.01 Flag-5