It seems starting from the network icon requires an extra service to work to start the service mention in the path you received.
Try going to the DiagPackage.diagpkg file in that directory and double clicking. It should open.
Next, open the Services panel (services.msc) and click the top of the name column to get the services in order. Then drop down and look for three services.
Diagnostic Policy Service.........Started.......Automatic
Diagnostic Service Host...........Started.......Manual
Diagnostic System Host............................Manual
Let us know what yours say... If the second one is not started, start it and try again.
You can also start the Troubleshooter from the Control Panel-Troubleshooting-Internet Connections.
That is a little strange. I wonder if some error is occurring and causing problems.I have noticed something very strange. When I read your previous post I tried the Windows Network Diagnostics tool using all three methods discussed and they all worked without running 'scannow' or changing any settings! I restarted my computer - and now they are all reporting errors again! Restarting the computer seems to be what causes the problem, but I have no idea why the troubleshooter suddenly decides to work sometimes.
That is a little strange. I wonder if some error is occurring and causing problems.
Does the Diagnostic System Host show as having a manual start? Can you shut it down?
Mine is stopped and I do not have an option to start it. If you cannot stop or if it starts again, check the properties of each service and see if they are set up as the attachment shows...
I am wondering if you need to reinstall your network adapter or have some other network problem...
In most cases, we recommend that you do not change the Allow service to interact with desktop setting. If you allow the service to interact with the desktop, any information that the service displays on the desktop will also be displayed on an interactive user's desktop. A malicious user could then take control of the service or attack it from the interactive desktop.
I just did a cold boot on my system and noticed the Diagnostic System Host service was started and did have options for starting or stopping. After a period of time, it went back to stopped with no start or stop options. Possibly it starts initially to check the system and then shuts down later.
Still do not have an answer to your problem.
I see another setting you might use. If you open the Action Center, Trouble shooting, change settings, there are check boxes for checking immediately when started. You might try unchecking that to see if it makes any difference.
I assume you have the allow updates already checked..not sure if it would do anything.
There is also an option to allow Windows to check for routine maintenance. Maybe turning it all off and waiting a couple of boots would reset something.
Two folks that have a problem in common can probably do more for each other than an outside observer. You guys can compare your systems, like how you installed Windows 7, what utilities you might be running, what devices you have, and anything else you might think of that would cause the unusual problem you both are experiencing.