Thanks call100, stickyb and Tarq57. I'm grateful to you.
stickyb...........
(1) Yes, it's connected to the net.
(2) Yes, I made sure he downloaded the latest security updates while I was there on Saturday evening.
(3) & (4)
AVG free is installed and up to date. When the neighbour phoned on Saturday morning, the first thing I did was get him to run a scan.
The scan didn't turn up anything at all.
(5) Haven't done a scan with MBAM but will attempt to get that done today.
I'll come back to you with full directory details later.
Tarq57......
Yes, I did a search for the executable but couldn't find a thing having made hidden files and folders visible. Odd......... very odd.
Thanks again,
N o t a