Windows 7: How to Disable Aero Peek (Preview Desktop)
Contributed by Rob Rogers 
Tagged: Microsoft Windows 7 By placing your cursor over the Show Desktop button (the small rectangle) at the end of the Taskbar, Aero Peek will show the Desktop. It does this by hiding any open windows and showing the outline of where they were. While this is pretty cool, it can be annoying.
If you hover your mouse over the Show desktop button on the Taskbar,
Aero Peek does this:
To disable Aero Peek:
1. Right-click on an empty portion of your Taskbar.
2. Select Properties.
3. On the Taskbar tab, go to the bottom and locate the Preview desktop with Aero Peek section.
4. Uncheck the Use Aero Peek to preview the desktop checkbox.
5. Click the OK button.
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belthur said on May 13, 2009
Or just press WinKey + Space….
Darcshado said on May 19, 2009
Wow, you guys are bloody idiots. He was showing how to disable it, not use it.
Sherry said on February 3, 2011
Thanks, worked for me!
Calchick said on May 26, 2011
THANK YOU so MUCH!!! very annoying when you are doing something important on the internet and that darn desktop pops up – mucho thanks!
non said on November 7, 2011
Or you can just point your mouse at that corner and right-click and make sure that “Peek at desktop” is deselected.