For starters they say don't restore settings from 2007. You may need to re flash.
Second, with a few exceptions the 2007apps won't work on os2008.

Before you re flash you can try this, go into application manager -> Tools -> Application catalog, and delete all your repositories.
Then go to the repository master list select your os2008 and select all repositories and install them.

Then hope you can update the available apps. The repositories are under a large strain and it's not likely it will update. I started disabling repositories, updating, then adding them back one or two at a time to identify what repositories were not loading.

Once you do that search for the 2008 versions of your apps and re-install.