the only extensions you will need to uninstall are:
Form Toolkit
CSS Form Builder (Make sure to use the 2.0.1 support release 2 version)
HTMLEditor 3
Security Assist 2
Design Extender
then reinstall them in the order listed above.
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These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.