Programs entering List

I'm at a loss for words as I don't know the name of the area that I want to
refer to.

I am using XP Pro and now my computer has developed the habit of putting
every program I open in the list above the ' All Programs ' ( that the area
I was referring to) I'm sure there is some tweak to control this but I don't
know where to find it.

The list gets long and then I keep getting the message that there is not
enough room. The icon size is set to small and the number of allowed
programs is set at 10.

Any thoughts please?