every single time I play Dunpa at different times for NO reason Windows Vista will pop up saying "the publisher cannot be verified" for the 7z.exe file under users/locallow/dnf/

How in gods name do I stop this? I've tried every single thing possible using Internet Explorer, searched literally for hours of google trying different methods, I've deleted the file and it comes back, I've disabled windows from actually running it and for some reason it STILL crashes my computer. What is this file and why won't it leave me alone? It has unknown publisher so I can't just click always trust it...and if I did, whether I click cancel or run, Dunpa crashes and it thinks I've died...huge problem when you are about to finish a King run and you get kicked out while you're at full health.

ANY help would be greatly appreciated...

As I mentioned, running Windows Vista Home Premium I think? So I can run that pgedit.msc file or whatever that everyone recommends and I've tried editting the registry and even adding lines to enable *.exe that line was never there initially so I don't know if I added it right...and even then, this exe kills Dunpa and closes it down...