I suddenly have exactly the same thing happening, whenever an email from facebook is opened in Outlook, this Open MG Secure thing starts installing. And the behaviour of outlook changes as well, can't delete emails with the DEL key, but can with the menu?!
I did found out it was related to SonicStage too, but I too used it for an old MP3 player, and since it's broke I thought uninstalling it would solve this problem too, but no..
I can make a rule to auto move facebook mails to my deleted items since they're usual not very intresting anyway, but I find this behaviour strange and a little suspicious.