dependency service/group failed to start; cannot start diagnostic policy service

I have windows vista home premium. I've not had a problem connecting to the internet before. Then just today, I cannot connect to my router, either by wireless or ethernet.  The router is fine, as my housemates are able to connect.  The signal strength is also excellent, but my computer is 'connected with limited access'.   The message I get is: 'Connection status unknown. The dependency service or group failed to start.'  When I click Diagnose and Repair, it says Network Diagnostics cannot run because the Diagnostics Policy Service is not running'  It then gives me the option to open the Service Control Manager to manually start the Diagnostics Policy Service.  This opens a Services window with a massive list of stuff I don't understand.  I've searched for solutions to the problem, and none have worked.  Any advice greatly appreciated.

Hello, Lesley

Thank you for using the Microsoft Answers Forum!

The following information was taken from:

Modifying REGISTRY settings incorrectly can cause serious problems that may prevent your computer from booting properly. Microsoft cannot guarantee that any problems resulting from the configuring of REGISTRY settings can be solved. Modifications of these settings are at your own risk!

It is possible the permissions on a specific registry key was altered. You can try correcting this by going to Start, type regedit in the command prompt, right click the regedit program and select Run as Administrator. In the Registry Editor click the arrow to expand the selection, go to HKEY_LOCAL_MACHINE, SYSTEM, CurrentControlSet, Services, DPS, right click Parameters and choose Permissions.  On the Permissions screen, select the TrustedInstaller user. If you do not see the TrustedInstaller user, click Add, type NT Service\TrustedInstaller and press OK. Ensure that the Full Control and Read permissions are checked for the TrustedInstaller user.

Let us know if this helps.

Microsoft Answers Support Engineer
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Last updated April 16, 2020 Views 164,451 Applies to: