Are you getting this error upon installation?

Overall summary:
  Final result:                  SQL Server installation failed. To continue, investigate the reason for the failure, correct the problem, uninstall SQL Server, and then rerun SQL Server Setup.
  Exit code (Decimal):           -2068578304
  Exit facility code:            1204
  Exit error code:               0
  Exit message:                  The specified credentials for the SQL Server service are not valid. To continue, provide a valid account and password for the SQL Server service.
  Start time:                    2010-08-04 10:03:59
  End time:                      2010-08-04 10:04:31
  Requested action:              Install

Check the command line you're sending to the SQL Server installer.  You may find that you need to escape the backslash characters in the SQL Server command line in your bootstrapper code for the accounts.

For example, notice the double backslashes?

/SQLSYSADMINACCOUNTS=\"BUILTIN\\Administrators\" /SQLSVCACCOUNT=\"NT AUTHORITY\\SYSTEM\"

Using LUA script.

Hope this helps someone.