OK, finaly I used %systemdrive%\software\Media\Ace Mega Codecs Pack\AceCodecsPack.exe /LOADINF="%systemdrive%\software\Media\Ace Mega Codecs Pack\settings.inf" /nocancel /silent /S" /f /SUPPRESSMSGBOXES and it worked, no AV. But I cannot get rid of the Browser plugin install.