By mistake the security registry folder for Microsoft Security Essential has been deleted by me

[BigyanWI]

By mistakely security registry folder has been deleted by me, for which I am unable to install the security essentials, and so many problems I am facing now, System restore point is also inactive, please suggest me how do I get that folder back in his place.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Microsoft Security Essential
The deleted folder is highlighted.

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