So I googled "EMET DEP" ... it's a security tool from MS built into Windows.
It is what's responsible for plugging holes in IE. Specifically the zero day bug.
It turns out it has caused a number of other applications to hang...
https://redmondmag.com/articles/2014...ty-issues.aspx might be worth the read.
In the case of the article, it was Excel that crashed.

Moar reading: https://www.google.com/search?q=EMET+DEP


-tg