IE Defender/Files Secure/MalwareBell/IE Antivirus Codec has been update, it installs a file with semi-random filename composed from fragment words: MEGAUP, MEGAUP, MEGAUP, ~1, LOAD, L
Possible filenames are: MEGAUP~1.dll, MEGAUPLOAD.dll, MEGAUPL.dll.
It displays alert messages with popups that download IE Antivirus:
Use SmitfraudFix to remove the infection.