Win7 thumbnail preview function can not be used how to do

Win7 thumbnail preview function I believe that people who have used win7 system are familiar, the so-called preview function is when we open multiple windows of this software, we move the mouse to the icon in the taskbar, you can preview all Open window. If this feature is gone, then all we can see is a bunch of text.
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Win7 thumbnail preview function is gone Why:
If you are not able to make any settings after opening the computer today, then it is recommended that you restart some of the possible recovery.
If you have just installed the win7 system, there is no such function, then it is very likely that the system you installed is pirated.
It is also possible to accidentally set the wrong, such as modifying the registry. Inadvertently setting the wrong three places may be wrong to set back, the following small series tell you where is the next place.
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Setting errors in the taskbar
The "Aore peek preview desktop function" in the taskbar properties is forgotten to open. As shown in the figure:

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The "Aore peek" function in the control panel is forgotten to open, you operate according to the following picture

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TaskbarNoThumbnail item in the registry The value is not 0, or there is no such item.
Start running input: regedit into the registry, and then navigate to: HKEY_CURRENT_USER---Software----Microsoft----Windows----CurrentVersion----Explorer. If there is no newer Explorer, then create a new DWORD key named TaskbarNoThumbnail with a value of 0. At this time, it should be OK to restart.
The above is about the win7 thumbnail preview function can not be used. Basically, only these three places will turn off this function because of misuse. If it doesn't work, then it should be your pirated win7 or poisoning.