Original title: Service 'Windows Defender' (WINDEFEND) failed to startWhen trying to install Windows Defender i get an error message that "Service 'Windows Defender' (WINDEFEND) failed to start. Verify that you have sufficient priviledges to start system services"How do I check what priviledges I have and I need?I noticed in task management that Norton's symlcsvc.exe was running and I wondered if this was clashing with Defender so I temporarily stopped Symantec process running in the Services area but still had same result trying to run the Defender's installation.Help please

Hi,This error message is because you have Norton installed on the computer. Refer the below article for more information.http://www.symantec.com/business/support/index?page=content&id=TECH103119&locale=en_USLet's try the below steps and check if this helps.Step 1: You may try uninstalling the Norton and then check if the issue persists.Note: Reinstall Norton back after checking.Refer: http://support.microsoft.com/kb/307895Step 2: Modify the registry value and check.a. Click on start button, type regedit.exe and press enter.b. Go to the following location: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Defender\c. Right-click on DisableAntiSpyware, on the right-hand panel, and selectModify.d. Enter 0, under Value data and click on OK button.e. Close Registry Editor.f. Reboot the computer.Registry Disclaimer:Important This section, method, or task contains steps that tell you how to modify the registry. However, 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:How to back up and restore the registry in Windows: http://support.microsoft.com/kb/322756Thanks and Regards Umesh P - Microsoft Support. Visit our Microsoft Answers Feedback Forum and let us know what you think. [If this post helps to resolve your issue, please click the "Mark as Answer" or "Helpful" button at the top of this message. By marking a post as Answered, or Helpful you help others find the answer faster.]