This is interesting. I had this issue some time ago, but it wasn't the 'file' itself. It was an OS issues, in this case Win 7 / 64 bit. You don't mention what OS you are using and that might help. In any case, I'm going to guess that if you try in install anything requiring an 'installer' you are going to get a flag saying you don't have permission to install. I would suggest looking up 'not able to install programs without permission' or something like that for windows, MS has a quick fix that will correct this issue. Turns out that sometimes an update corrupts this feature and needs to be fixed. I could not install anything even using 'run as administrator'. The other option is to manually install the ENB which I always do and that isn't difficult to do and that will avoid using the 'installer' that comes with that ENB. Anyway, from what you describe, this sounds like a 'Windows' issue so I'd try looking there and not at the ENB itself. Hope this helps, just throwing it out there.