Ending the process Explorer.exe using the Task Manager and then re-launching it from the File menu, or simply restarting the computer, usually resolves it. The cause is usually an installed shell extension, such as the search bar now located on your Taskbar, and resolved by uninstalling the offending extension/application.
Hope this helps,
John
The normal Black toolbar at the bottom has decided that all of its programs should be push right instead of on the left. This happened before and it fixed somehow. Does anyone know what to do?
http://img6.imageshack.us/img6/630/24293416.jpg

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