Thanks for the interesting responses, guys.
I wasn't really contemplating taking legal action. I thought that perhaps there might be some consumer watchdog organisation somewhere that might be able to pull them into line a bit - but, as I think more about it, such a watchdog would probably be toothless, anyway.
I thought they might have at least said "sorry", and maybe even made out that they were working hard at eliminating such slip ups.
But, as was pointed out, brightcloud.com (or webroot) really have nothing for which to apologise. It's all the fault of that damned "Automated Classifier" - that's who *should* be apologising.
In reply to Re^2: brightcloud.com - for those who like a touch of venom with their snake oil