Microsoft Security Essentials
First you will want to download and run the Microsoft Fix it tool from here: http://go.microsoft.com/?linkid=9775235
In our instance, the Fix it tool doesn’t clean/fix everything and we still need to delete a certain registry entry. So go to the start menu and launch “Regedit.”
Now browse to the following location. One of the folders under the “Uninstall” folder will contain a Microsoft Security Essentials entry on the right hand side. Delete that one.
Reboot your computer, and hopefully the error is now gone.