If you are using a custom set of templates, please change back to the default template set
Upload the contents of the htdocs/ folder to your webserver, overwriting your existing files
Clear the contents of your cache/ and templates_c/ folders
Flush your browsers cache
on Windows IE & Firefox you can do this by pressing CTRL+F5.
MAC & Safari users can press CTRL+R,
Linux Users can also press CTRL+R or CTRL+F5 when using Firefox
Delete the upgrade/ folder from your server
Content migrated from the previous core content manager to the Content module must have their short urls checked and any Symlinks for those pages must also be checked for validity