Windows 7 rundll33 windows host process

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running win 7 on dell laptop evrytime I try to reply to an craigslist email ad
i get ths

Windows host process (Rundll32) appears every time I open my IEHere is the basic message: Internet Explorer Security ---pops up every time I open IE! A Website wants to open web content using this programName: Windows host process (Rundll32) Publisher: MS Windows"This program will open outside of protected mode..........." I have tried to find it and enable it in Add Ons. It is not appearing there in Enable Add Ons. Also, it is greyed out to allow it with the check mark when it first appears. Anyone else have this nuisance problem?​