The single most visible change in Windows 7 is the new “dock style” taskbar, which shows icons instead of buttons, with all application windows combined within a single button.
This is what the new taskbar looks like:
Changing the Windows 7 Taskbar to XP/Vista Style
To revert back to the older style, the first thing you’ll need to do is right-click on any open area of the taskbar and choose Properties from the menu.
From the Taskbar buttons drop-down menu, you’ll want to choose “Never combine”, which will make every window show up as a separate button on the taskbar, or you could choose “Combine when taskbar is full”, which does just like it says.
Now you should see the buttons show up with text labels like you are probably used to… but in the Windows 7 style.
If you chose the “Use small icons” checkbox in the properties screen, the taskbar will actually shrink down to look very similar to Vista.
The only problem is that the “pinned” icons are still sitting on the taskbar, which isn’t the same as Vista or XP, but you can easily remove all of them by right-clicking and choosing “Unpin this program from taskbar”.
Also you can choose the “Windows Classic” theme under the Desktop \ Personalize section: