Best answer by Rakanisheu RetiredView original
Windows 8.1 Compatibility
OK, let me say up front that I am fully aware that Preview and Beta OS builds are not officially supported. That said, I do wonder what the current state of the code is in terms of compatibility with the current Windows 8.1 Preview release?
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In some cases simply re-installing the toolbar may also help. Here is a toolbar utility to help this: http://download.webroot.com/toolbarfix.exe