NOTE: Before this change can be made, the .NET user account (typically ASPNET for WindowsXP or NETWORK SERVICE for Windows Server 2003/Vista or IIS_IUSRS for Windows Server 2008/Windows7) must be given read/write/modify access to the folder the web.config file resides in, and decrypt the web.config file in the Site Configuration Wizard. Contact your host for assistance with making that change, and backup the database and web.config file prior to changing the encrypt key. This can take some time, do not stop the process once it has begun!