Hi again Sean, I decided to uninstall Fences completely and go back a few versions, where things worked just fine.
So, I installed my trusty old Fences Pro, system restarts, windows loads with no issues whatsoever. Fences Pro does not set off any UAC prompts (on MY system}.
I then did a few restarts, a shutdown and then boot up... no issues at all (I try to be thorough).
I then uninstalled Fences Pro, restarted, and installed Fences 2.13 and activated it, then restarted... back came the UAC prompt (yes just one this time).
I noticed that Pro installed to Prog files as default, but 2.13 and I assume 3 install to Prog files(x86) BUT I overrode the installation of 2.13 and put it in the 64 bit folder just to see what would happen. At least I got it down to one UAC prompt eh? Lol.
I'll continue to play about and if I get any success I'll post here.
Thanks for your time, it is appreciated.