IE Defender/Files Secure/MalwareBell/IE Antivirus/Total Secure 2009 Codec has been update, it installs a file with semi-random filename composed from a dictionary:
gas, gam, gm, pt, st, ai
Possible filenames are:
gaspt.dll, gasst.dll, gasai.dll, gampt.dll, gamst.dll, gamai.dll, gmpt.dll, gmst.dll, gmai.dll
It displays alert messages with popups that download Total Secure 2009:
Use SmitfraudFix to remove the infection.