Firefox 4.0.1 is constantly freezing, having to reboot constantly, and not responding to key strokes, and very slow responses to keys strokes and to change sites

firefox 4.0.1 is constantly freezing, having to reboot constantly, and not responding to key strokes, and very slow responses to keys strokes and to change sites. Firefox 3. (the previous incarnation of firefox) did not have such problems - this has started since "upgrading to 4.0.1 - I want to change back to the previous Firefox since this is a serious problem - need specific instructions on how to go back to the old Firefox

Do you have multiple keyboard layouts installed?
It is possible that you have switched the keyboard layout by accident.
* http://support.microsoft.com/kb/258824 - How to change your keyboard layout
Windows remembers the keyboard layout setting per application and you may have changed the keyboard layout by accident via a keyboard shortcut.
* http://windows.microsoft.com/en-US/windows7/The-Language-bar-overview The Language bar (overview)
* Make sure that you have the Language bar visible on the Windows Taskbar
* You can do that via the right-click context menu of the Taskbar: Toolbars > Language Bar
* Check the keyboard language (keyboard layout) setting for the application that has focus via the icon on the Language bar
* You need to do that while Firefox has focus because Windows remembers the keyboard layout setting per application

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