Win7 under the taskbar is gone, how to do

About win7 under the taskbar is missing, how to do the problem answer
(A) set the Windows7 theme the easiest way is to set the Windows7 theme mode, click the right mouse button anywhere on the desktop, Type the menu item "Personalization (R)", this function is to set the Windows7 theme mode, Home Premium, Professional or Ultimate has this feature, by default Windows 7 uses the Aero theme, this theme There is a taskbar window preview function.
(2) Setting the taskbar window preview function
Method 1:
1. Expand “Start”→“Run” (or use Win+R)→type“ GPedit.msc”→“OK”.
2, expand to: "User Configuration" (user configuration) & rarr; & ldquo; Administrative Templates & rdquo; (administrative template) & rarr; & ldquo; Start Menu and Taskbar & rdquo; (task bar and start menu).
3. In the right panel, find Turn off taskbar thumbnails (close the taskbar window preview) → double-click to select "D……” (disabled).
4, after completing the above settings, restart the system, the taskbar window preview function is enabled.
Method 2:
1. Expand “Start”→“Run" (or use Win+R)→ type“regedit”→“determine”post →start Registry Editor.
2, expand to [HKEY_CURRENT_USER\\Software\\Microsoft\\Windows\\CurrentVersion\\Policies\\Explorer]→ if there is no "Explorer” key, you can create a new one. 3, in the right panel → right → new DWORD key value & rarr; named "ldskbarNoThumbnail" rdquo; → set the key value to “0”.

4, after the completion of the above settings, restart the system, the taskbar window preview feature is enabled.