http://blogs.technet.com/mmpc/archive/2008/11/19/msrt-review-on-win32-fakesecsen-rogues.aspxWin32/FakeSecSen was added to MSRT November release as Hamish mentioned in his MMPC blog . We’ve since observed MSRT removing FakeSecSen from 994,061 distinct machines. Breakdown of these removals by regions is shown as below. Region/Country Distincten-USCommunityServer 2.1 SP1 (Build: 61025.2)