I'm afraid not - can can upgrade the version of a database, but not go the other way. SQL Express is free and comes with VWD, so if you've installed the latest you should be OK.
Note that you have to uninstall everything to do with the beta, including all bits that get installed SQL (MSXML 6, SQL native client, etc). There is a tool to help you do this, at
http://blogs.msdn.com/astebner/archi...30/413764.aspx.
Dave