The credentials you provided during SQL Server 2008 install are invalid.

When installing SQL Server 2008 you are at one point asked to provide
the service accounts and passwords for the SQL services and agents.
When providing these service accounts and passwords you might encounter
one of the following error messages, which prevents you from continuing
the installation:

- 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.

I don’t know if this is a common problem,
but it seems that logging on as the Local Administrator is the root
cause for these errors, at least in my case. Logging on as domain admin,
not a local admin and i could enter the service accounts with passwords
and continue the install without any problem.

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