This tutorial is for them who have ui_mp_x86.dll issue every time execute ET.exe, also it helps for who run Et under Windows 7 or 8 and have some crashes.
First then nothing we must locate our executable.
Right click over your ET icon. -> Properties
Click on Properties -> Open File Location
Next step is right click over Et.exe -> Properties -> Compatibility
Then you must select Compatibilty, later mark Run this program in compatibility mode for Windows XP service pack X and Run this program as administrator.
After all of this steps your problem is ended. You can run again Et.exe with no problems.
Updated: 11/06/16 | Thanks Platonic