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no network connection found, diagnotic policy service won't start, error 5 access denied

Posted on 2011-03-23
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Last Modified: 2012-05-11
Previous solutions to this problem suggest using system restore, but all of my system restore points have mysteriously disappeared. I am now running a Security Essentials scan, don't know what else to try.
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Question by:pmerrion
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Expert Comment

by:nobus
ID: 35204906
is the network card installed without errors in device manager?
what are the results from ipconfig ?  (in run - type cmd+ enter, then type ipconfig + enter)
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Expert Comment

by:Jackie Man
ID: 35205841
Run sfc /scannow in an elevated command prompt first.

Details of sfc /scannow is as follows:-

Run the Vista System File Checker Tool:

http://www.tech-recipes.com/rx/2231/vista_run_system_file_checker/

1. Open a Command Window in Administrator mode:

* clickStart
* click All Programs, thenAccessories
* right click on the Command Prompt option,
* on the drop down menu which appears, click on the Run as Administratoroption.

* If you haven’t disabled User Account Control (and you shouldn’t!) you will be asked for authorisation. Click the Continue button if you are the administrator or insert the administrator password.

2. Start the System File Checker

* In the Command Prompt window, type:sfc /scannow,
* press Enter.
* You’ll see “the system scan will begin”.

The scan may take some time and windows will repair/replace any corrupt or missing files. You will be asked to insert your Vista DVD if it’s needed.

Close the Command Prompt Window when the job is finished.

One caveat: you need a Windows DVD to enable SFC to make more than minor repairs.

http://support.microsoft.com/default.aspx/kb/928228

“How to analyze the log file entries that the Microsoft Windows Resource Checker (SFC.exe) program generates in Windows Vista”

If sfc /scannow does not work, try to scan for Malware/spyware:

http://www.malwarebytes.org/mbam.php
 
Malwarebytes is as the name says, a Malware Remover!

Download the Free Version from the link above.

Download, install, update and scan once a fortnight..

How to use Malwarebytes after it is installed and Updated:

1. Open Malwarebytes > Click on the Update Tab  across the top> get the latest updates.

2. On the Scanner tab, make sure thePerform full scan option is selected and then click on theScan button to start scanning your computer

3. MBAM will now start scanning your computer for malware. This process can take quite a while.

4. When the scan is finished a message box will appear

5. You should click on the OK button to close the message box and continue with the Malwareremoval process.

6. You will now be back at the main Scanner screen. At this point you should click on theShow Results button.

7. A screen displaying all the malware that the program found will be shown

8. You should now click on the Remove Selected button to remove all the listed malware. MBAM will now delete all of the files and registry keys and add them to the programs quarantine. When removing the files, MBAM may require a reboot in order to remove some of them. If it displays a message stating that it needs to reboot, please allow it to do so. Once your computer has rebooted, and you are logged in, please continue with the rest of the steps.

9. When MBAM has finished removing the malware, it will open the scan log and display it in Notepad. Review the log as desired, and then close the Notepad window.

10. You can now exit the MBAM program.

Source: http://social.answers.microsoft.com/Forums/en-US/vistahardware/thread/c03dab96-f1df-477a-9451-9d665c36fe23
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Accepted Solution

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pmerrion earned 0 total points
ID: 35237590
I tried these solutions and they didn't work. I didn't want to reinstall Vista and start from scratch (I just did that late last year) but I finally realized I could selectively restore Windows system files from an Acronis disk image I had made a few months ago. That got me back up and connected, at least so far.
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Author Closing Comment

by:pmerrion
ID: 35304419
Thanks for your suggestions. They were all good ideas but I had some kind of corrupted system files, I guess.
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