Log onto what? Windows I presume but what version? And is it the OS or an application displaying this "most visited" [what?] message? What is the exact wording of the message(s)? Need more info.
So you mean Internet Explorer [v9 I guess?]? If so then Google "Internet explorer" and "remove" or "disable" and "most visited" and you will almost certainly find the answer.
Thanks ClubMan, having "googled" the issue, I came across this;
[broken link removed]
Then it turns out, all I had to do was click an "X" that was at the end of the line of "most visited" and" Recently closed" !!
However,in my defence, the "X" wasn't visible until I hovered over the end of the line..
Thanks for your replies.