Stop any third-party tools installed on the server.
2
Disconnect all users from the server.
3
Uninstall your current version of SQL Server.
=
If you currently use SQL Server 2005 and are upgrading to SQL Server 2008, if a "Setting Internal Properties" error occurs [Figure 168], go to Microsoft support, knowledgebase number 919945 (http://support.microsoft.com/kb/919945).