Actually I just found the same web page 5 minutes ago after running a full virus scan to make sure it was not something that came in my mail. I changed changed the settings as instructed and it appears to have fixed the problem on my home PC.
From what I could sort of find from putting my mouse over the message it appeared to be something to do with chat.
Did you just change the background wall paper in the last hour or so, or did I do something else trying to fix my problem?