WOW thanks for that 'dharry' there was some info on there I missed when I looked through it earlier.
This time I made sure I deleted the licence key and Virtavia folder on the C:\ drive (they were still there even though I had uninstalled the product), re-downloaded the installer using the F-1 wrapper, made sure UAC was 'off', the AV was disabled, made sure the installer was in the same folder as the licence key and ran the installer in 'Compatibility mode for a previous version of Windows' and this time it installed OK with a usable chopper in-sim.
Now I need to copy over all the extra paints and cfg file tweaks I did from the old computer.
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