On a Windows XP Professional with XP3 attempts to upgrade/install SQL Server 2008 failed. The correct authentication was not recognized and only a few files were created.
First attempt: To upgrade an existing SQL Server 2008 Enterprise (evaluation) [Mysorian] failed in the last step of the upgrade. However the following files were added to the SQL Server folder on the machine. It appears that the upgrade process created not only Upgrade files but also install files as shown here.
Second attempt: Tried to install a new server[Ganga]: failed.
Later in the maintenance mode, the repair option to repair the failed fresh install worked but cannot connect to the named instance of SQL Server 2008 R2 Nov CTP.
Named instance Ganga of the fresh install
A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified) (Microsoft SQL Server, Error: -1)
For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&EvtSrc=MSSQLServer&EvtID=-1&LinkId=20476
The splash screen of the SQL Server 2008 in Management Studio appears to belong to R2 November CTP as well as the short cut for the CTP programs. However the following files were added to the SQL Server folder [MSSQL10_50.GANGA] on the machine.