Thanks, Boggin, that rules out AVG, we don't want extra browser add-ons we don't ask for.
Bonsoir Monsieur Still_Game, thank you for your answer. I've been a huge fan of MBAM for years and haven't had problems with 3.0 other than that the pop-up window didn't want to change back to the smaller size once I made it full-screen (told them but it's still the case). Another IT person just told me of conflicting issues between Avast and MBAM but I'm sure you know the easy solution to this: putting both folders in each others' exclusion lists.
That's good to know, that a multilayer defence is still preferred, even by the MBAM people. I don't know why I'm always wary about beta versions. Should I be?
Right now I think I'll continue with BullGuard. It seems to be somewhat lighter now. In Process Explorer MBAM is now second behind Firefox and BG is 7th. It's a really good and reliable program and its customer service is the best.
I recommend regular backups to separate media, a multilayered approach and, above all, being eternally vigilant for suspect content!
Of course!
And what about herdprotect.com? Portable, so it's very light. Looks like a very handy extra tool! Maybe even better than ESET online scanner?