In case you get the following errors:

The credentials you provided for the SQL Server Agent service are invalid. To continue, provide a valid account and password for the SQL Server Agent service.

The specified credentials for the SQL Server service are not valid. To continue, provide a valid account and password for the SQL Server service.

Here’s the simple solution:
http://www.jadota.com/2009/01/the-credentials-you-provided-during-sql-server-2008-install-are-invalid/

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