Thank you for your prompt response.

I have A08 and there is a new release A09 (release notes seemed to indicate this was solely a fix for Lojack) so I was saving that update hassle for later.

Anyhow, another half hour of Googling turned up a solution by suggesting that a full reboot was required (rather than ctrl-alt-del or a Windows restart).

So I :-

1) powered down my laptop completely

2) removed the power cable

3) removed the battery

4) held down the power button for a couple of seconds

5) replaced the battery

6) rebooted into Windows

and. lo and behold, Windows HAV Detection Tool is happy (see new screenshot below)

I don't know if all those steps were required or if a "simple"  restarted would have done the trick but that is exactly what I did.

I was just about to post when your reply popped up!

Thanks again,

Pete

PS

unfortunately Android Virtual Device Manager is still reporting "HAX is not working..." so I have just moved the problem up the chain at the moment - don't suppose you are an Android emulator expert are you?!? ;-)