Windows 7: The Diagnostics Policy Service is not running

Suddenly, this morning, my computer stopped being able to connect to the internet. When first starting it up, it couldn't detect my 2nd monitor, and everything was zoomed in to 600x800 instead of the typical 1920x1200. I also got a message saying my AMD video driver wasn't working. After some fiddling, I can once again see the 2nd monitor, and it's stopped giving me the AMD error.

Anyway, when I went to troubleshoot my Internet, I got the error message "The Diagnostics Policy Service is not running". I've been checking around and trying various things. I have already tried the 3 methods listed below. Method 1 gives me an Error 5: Access is denied. Method 2 had no appreciable effect. Method 3 - the scan came back clean. Method 4 had no appreciable effect. Any other advice you could provide would be greatly appreciated. Thank you!

Method 1:

a.  Click on Startbutton.

b, Enter services.msc in Start search option.

c. Right click the Diagnostics Policy Servicesand start the services.

**Method 2:**This issue may occur when the account Trusted installer is missing the permissions for the key below:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\DPS\Parameters

Permission needed: Full Control, Read

**Note:**Serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection,

back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the 

registry, click the following article number to view the article in the Microsoft Knowledge Base:

(http://windows.microsoft.com/en-US/windows7/Back-up-the-registry )

a. In Registry Editor(click start, type “regedit” and hit enter), browse to the  above mentioned key for which you need  to add permission.

b. Right click the key, and click Permissions. (HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\DPS\Parameters)

c. Click “Add” Button under usernames. Make sure Locations is selected to be the local computer.

d. In the "Enter the object names to select field, type "NT SERVICE\mpssvc". Then click “Check name.”

e. Click OK.

f. Then select the account which appears in the list, and add the appropriate permission (Full Control, Read) for it.

g. When this is done, click OK.

**Method 3:**Run System File Checker (SFC) scan to fix any corrupt system files. To do this, follow the steps mentioned in the link:

How to use the System File Checker tool to troubleshoot missing or corrupted system files on Windows Vista or on Windows 7http://support.microsoft.com/kb/929833

**Method 4:**go to start ,search and type:- cmd, right click on returned cmd.exe and select "run as administrator" at the prompt type:-

net localgroup Administrators /add networkservice

press enter then type:

net localgroup Administrators /add localservice

press enter then type:

exit

press enter and restart your computer

Open services and make sure the service is started.