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Windows 7 has a new taskbar function called Jump Lists. If you don’t like or use this feature, you can simply disable jump lists. Just follow these instructions.
Disable skip lists
Right-click Taskbar > Properties > Start Menu tab > Disable Store and display the most recently opened items in the Start menu and taskbar > Apply > OK.
The taskbar icons now look like this.
You can also configure it using the group policy editor.
You no longer display jump lists or recently opened items or search history.
Go here if you notice that your skip list is missing or definitely missing in Windows 7.