IE Defender/Files Secure/MalwareBell/IE Antivirus Codec has been update, it installs a file with semi-random filename composed from fragment words: aol, aol_, aol2, tbl, bho, toolbar
Possible filenames are: aoltbl.dll, aolbho.dll, aoltoolbar.dll, aol_tbl.dll, aol_bho.dll, aol_toolbar.dll, aol2tbl.dll, aol2bho.dll, aol2toolbar.dll
It displays alert messages with popups that download IE Antivirus:
Use SmitfraudFix to remove the infection.