Whatever has caused this issue with Microsoft Security Essentials and Windows Defender flagging the Win32/Critet.BS Trojan in Windows
Repair v4.0.15, whether it be Microsoft or the Repair_Windows.exe in v4.0.15, here is a good question to ponder :
Why is v4.0.15 flagged as Infected and v4.0.14 is NOT ?? This question looks like something went wrong with v4.0.15.
Just my 2 cents worth.
fabrikator