Recently we posted about adjusting Taskbar thumbnail live preview delay time. In Windows 7, whenever you hover your mouse cursor over a running application's button in Taskbar, Windows shows a small thumbnail of running application with a close button and if you hover your mouse cursor over the small thumbnail, Windows shows a live preview of the running application and makes all other running applications windows transparent.
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If you don't like the live preview feature and want to turn it off, this tutorial will help you. Today we are sharing a small registry trick to disable these live previews.
So here we start the tutorial:
1. Type regedit in RUN or Start Menu Searchbox and press Enter. It'll open Registry Editor.
2. Now go to following key:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
3. In right-side pane, create a new DWORD value DisablePreviewWindow and set its value to 1 to disable live previews.
PS: If the above trick doesn't work for you, create new DWORD DisablePreviewDesktop instead of the above mentioned DWORD and set its value to 1. (Thanks to our reader "TheAslan" for this info)

4. That's it. Log off or restart your system to take effect.
NOTE: If you want to restore default settings, simply delete "DisablePreviewWindow" DWORD value or change its value to 0.
PS: If you want a ready-made script to do the task automatically, download following ZIP file, extract it and run the extracted REG file. It'll ask for confirmation, accept it:
Posted by: Vishal Gupta | Categories: Windows 7
Pepe
The feature is call "Aero Peek"
Control Panel > System >
Advanced system settings > Advanced tab > Performance > Visual Effects > Enable Aero Peek
Uncheck the box.
Stamimail
I want to use the taskbar buttons themself to get "a live preview of the running application and makes all other running applications windows transparent". (without the need to hover the preview windows)
IS IT POSSIBLE?
Rich
How to fix the thumbnail goes as follows
right click you background go to screen resolutions/ Advanced settings / monitor / Colors/
Set True color (32 bit) for thumbnail previews
set high color (12 bit) for list view previews.
Rich
Yes, try what I said below for windows 7 worked for me to get the transparent thumbnail or to switch it to the list view.