Well, the neighbour has seen the light and disposed of his P2P software.
The NaviPromo adware was quarantined and subsequently deleted but the .exe still shows as a start up program although disabled.
Running msconfig shows the Command as: C:\Documents and Settings\User Name\Local Settings\Application Data\kgkadi.exe"kgkadi, and the Location as SOFTWARE\Microsoft\Windows|CurrentVersion\Run.
I don't know if I can reasonably assume that it is now no longer doing any harm. Sorry to trouble you further, but does anyone have any additional thoughts on the subject?
Thanks,
N o t a