It stops when I press Ok on a browser button.
It doesn't appear to doing any harm, but it is annoying.
It comes up "bg5.htm from www.thepaymentcentre2.com" at present.
I'm reasonably sure that the info was different previously.
On a web search, the only reference I get to the above is a SCHOOL page.
Thank you gerryf for your help with my system32 files.