Fix for When Pinned Jump List Items Get Stuck in Windows 7
 

One of the greatest new features in Windows 7 is the Jump Lists that show up when you right-click on the icons in the taskbar, but have you had a problem with them getting stuck? This happened to me, and luckily I found a solution.

The solution isn’t perfect, in fact it will pretty much wipe the slate clean, and remove all of your pinned items—but hopefully just the ones for Windows Explorer and not the rest of your applications.

http://www.howtogeek.com/howto/5245/...-in-windows-7/