At last today I finally managed to resolve this issue where Install and Uninstall of Realtek HD 2.72 (executable setup) onward drivers failing for me on Windows 8.1.
It was "Maximum Security Settings" of Enhanced Mitigation Experience Toolkit from Microsoft, as a workaround if you switch to "Recommend Security Settings" then executable setups will work fine. It happens with EMET 4.0, EMET 4.1, EMET 4.1 update 1 and till EMET 5.0 TP3.
I filed bug on EMET 5.0 Microsoft Connect Feedback, here is its URL: https://connect.micr...ll-or-uninstall
Hopeful that they fix it.
Here is screenshot of what to do:
I only bumped this thread to add worthwhile solution for only scenario affecting me.
For others Eric solution using ZIP drivers and using Device Manager also works.