Bufferzone has left the building: .gif)
This is for information guys, and I'm cutting a long story short(er) here.
Bufferzone is obviously a very complex program, insofar that it installs a lot of stuff, and not just in the registry. It installs its own processes running from startup, as well as the virtual "protection zone".
Because of that, it also comes with a pretty complex "uninstall" feature.
Like a lot of people here and elsewhere, I've been relying too much on third party installation "tracking" applications as the best way to go.
On this occasion, that was the BIG mistake.
The only thing that removes this cleanly is it's own installer. And although I didn't like Bufferzones seemingly invasive install, or it's functionality, compared to Returnil or Powershadow, I must give credit and say that if the application is uninstalled correctly, then there are no problems removing it cleanly.
The entire saga was caused by tracking it, and then trying to remove it, with ZSoft.
And that's not a failing of ZSoft in particular, IMO, any third party tracking app would have screwed this up.
After trying every method under the sun to remove this, the final option was to install it again, and try using its own installer to remove it. After going through the install and restart, it turned out to be a simple operation to "unload" Bufferzone with the sys tray icon, and select "uninstall".
On doing that, this window popped up:

Not your average uninstall feature.
After checking the 3 options, the installer did it's thing, and prompted a restart.
I then did a thourgh search, and found only a couple of minor things in the registry which deleted easily.
So, what I've learned from this, and this is my choice, you guys make your own minds up, is to use a third party "tracker" as a second option uninstaller, after first trying a programs own installer first.
What's annoying in all this, is the fact that I never usually install anything I'm trying out, if the install needs a reboot, as this negates Returnils "restart, everythings gone" magic. But on this occasion I was tempted to stray from that, and I got my a**e well and truly bitten.
That's the short(er) version. ![:)]()
Anyway, thanks to Hazel, Andavari, and AndyManchesta for their input, although I have actually figured some of this stuff out myself.