Thanks lem729 the adblocker works. Great. Of course that means I've still got the malware on my computer so thanks blackbird71, I've looked as best I can so thanks for the tip to look at Wilders or DSLR security cleanup forums in case maybe some people there can tell me what to do next. Or next time one of my techie mates is around maybe I'll ask them though I suspect that this may be slightly out of their orbit. I suppose that if I just delete all my downloaded stuff, which is mostly just text but saved in Word so probably full of nasties, and also some pictures which I gather are common vectors for malware, and maybe all my writing, then that might get rid of it. Obviously I'll back up all the stuff that I might want to use some time.

Thanks everyone, I'll try all that and report back if I succeed (or not) - which may be of use for other people suffering the same attacks. The videos that the hackers keep serving up are stopping me watching telly as well. Amazing. In the year 2014, corporate business getting aware with extreme hacking and noone's stopping it. Oh well, first world problems, at least it hasn't completely killed my computer (yet) - and I'm not starving to death and dying of treatable diseases in the middle of a warzone, so it could be worse, I suppose...

Does anyone know how to remove adchoices spam from Opera please?
I've done :
1 remove from Mozilla Firefox by resetting Firefox - didn't work
2 malware scans using :
Avast
Malwarebytes
Avira
Spybot Search and Destroy
all failed, the spam is spamming away all the time
3 deleting various downloaded material - didn't get rid of it
Also, how come adchoices spam is allowed and is not blocked by UK, US etc governments, regulatory agencies, anti spam organisations etc.
Would some hackers and people in the anonymous umbrella like to take it down, please, thanks.