Previewing the content of a minimized tab in the taskbar is a useful feature in Windows 7. Unfortunately, it only displays the preview in a small popup box so that you cannot  see clearly some parts of the content. To increase the size of this preview box, no need to install any third party utility since you can do it through a couple of simple steps.

How To Increase The Size Of Taskbar Thumbnail Preview On Windows 7

More about the guideline, read How to Increase the Taskbar Thumbnail Preview Size in Windows 7

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