IE Defender/Files Secure/MalwareBell/IE Antivirus Codec has been update, it installs files with semi-random filenames, composed from fragment words: t, p, b, a, o, u, sant, post, sect, 32, 16a, 8x
Files could look like: tosant32.dll, pasant32.dll ...
and displays alert messages:
Use SmitfraudFix to remove the infection.