IE Defender/
Files Secure/
MalwareBell/
IE Antivirus Codec has been update, it installs files with semi-random filenames, composed from fragment words: nav, nvg, nv, filter, flt, f
Files could look like: nvgflt.dll, nvgf.dll ...
and displays alert messages with popups:

Use
SmitfraudFix to remove the infection.