Internet explorer

[geoffl]

Hi,
I have 2 win 7 computers. Both have internet explorer in the tray.
On one I can open several instances and when you hover over the icon you see each open window just above and can click on one to make it active.
On the other computer icon in the tray is sort of stacked sideways showing how many instaces are open. right click and a menu appears showing all the avaliable instances.
Why are 2 computers different and how do ai make them the same?
Geoffl

[Allan]

Right-click on the START button - Personalize - Taskbar - "Group Similar Taskbar Buttons"

[geoffl]

Thanks Allen,
When I click on start it says ' open windows explorer or properties'. In properties I can't see personalise anywhere. There is Taskbar, start menu or toolbars
What am I doing wrong?
Regards
Geoffl