Hiding the update will certainly stop the notification on the PC but I am having this problem on a network with a WSUS server so no matter what I do on the client I will have this one update showing as needed on WSUS. I am having the issue with update 1.179.2500.0 instead of the 3002 that so many here are seeing. I can't decline the update because it has not been superseded - well, I could decline but then I may not have protections required.
It sure seems like someone just forgot to put in whatever pieces let windows update know the update is not needed - maybe a file version not added to the right list or something.
See "Manually download the latest updates", and read the rest of the web page too. See if manually downloading the "Definitions" breaks the loop?
Malware Protection Center
http://www.microsoft.com/security/portal/definitions/adl.aspx?wa=wsignin1.0
Did anyone try my earlier suggestion to hide the update?
If you switch off Automatic Updates and set them up to not download and only notify you then it is possible to hide a troublesome update. After doing such a thing you may return to your normal Automatic Update settings.
Control Panel\All Control Panel Items\Windows Update\Change settings
Hide Windows 7, or 8, Updates that you do not Ever Want to Install
http://technet.microsoft.com/en-us/magazine/ff382716.aspx
This is the one update that I would hide if it was my decision (as it is the oldest update).
Definition Update for Windows Defender - KB2267602 (Definition 1.193.3002.0)