Windows Defender does not open

I recently had to reinstall MS Security Essentials. Now cannot open/start Windows Defender. A window appears and says that WD is off. When click to open get message - "WD has encountered an error: 0 x 80070424 - the specified service does not exist as an installed service'." "

have always been able to use it - obviously was and should be installed/available service!

Any advice much appreciated

Chris

It's normal. Windows Defender is disabled or in XP uninstalled when you install Microsoft Security Essentials because MSE includes the Windows Defender antispyware feature. If you use XP and Windows Defender is still listed in Add/Remove programs you must uninstall/remove it.

Microsoft Security Essentials vs Windows Defender
http://blogs.msdn.com/b/securitytipstalk/archive/2010/08/26/Microsoft-Security-Essentials-vs-Windows-Defender.aspx

Windows Defender and Microsoft Security Essentials on Windows 7, Windows Vista and Windows XP
http://answers.Microsoft.com/en-us/protect/Forum/protect_start/Windows-Defender-and-Microsoft-Security-Essentials/5309cb8d-02e1-40E8-974f-0dcedb9ab9fd

I hope this helps.

Tags: Windows

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