A pal has just got got. PConverter. Nasty.
I'm not entirely sure how to get rid of it. He runs BullGuard or some such for which he has paid. That was no help at all.
It takes over FireFox's Home Page and repeated attempts to set to Google are undone. I can't find where the source of the problem lies.
I'll try Malwarebytes etc., tomorrow, but wondered if anyone had experienced this nasty intrusion and if doing that is enough.