If this doesn't fix the problem, it's time for an upgrade
How to Show Thumbnail Previews Above Taskbar Icons in Windows 7
One of the nice features of Windows 7 is that the taskbar shows a handy thumbnail preview of a window or group of windows when you hover over it. So if you have multiple Internet Explorer tabs open, you can now see a preview of all IE tabs instead of just text descriptions.
That's really cool, but when I first installed Windows 7 on my computer, my thumbnail previews didn't work. I only got the text descriptions!
That didn’t work! No thumbnail previews on the Windows 7 taskbar! After some fiddling around and trying a bunch of different things, I finally got the thumbnails on my system! In this article, I’m going to walk you through the different methods to fix this issue in Windows 7.
