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Exchange 2010 install failing - Can't create Admin Group

I'm having an issue trying to install Exchange 2010 into my Exchange 2003 environment. See below for the error message. Basically it can't create the Exchange Administrative Group (FYDIBOHF23SPDLT) during the hub transport installation portion.

Also, in the past I had manually delete an Exchange 2010 admin group because the server failed and couldn't be restored. Could this be causing the issue?
(this was previous issue -

[03/09/2011 17:04:00.0495] [2] Beginning processing new-exchangeserver -DomainController:'DC1.XX.XX.XXX' -Name:'MAIL'
[03/09/2011 17:04:00.0557] [2] Could not find the default Administrative Group 'Exchange Administrative Group (FYDIBOHF23SPDLT)'.
[03/09/2011 17:04:00.0557] [2] Ending processing new-exchangeserver
[03/09/2011 17:04:00.0557] [1] The following 1 error(s) occurred during task execution:
[03/09/2011 17:04:00.0557] [1] 0.  ErrorRecord: Could not find the default Administrative Group 'Exchange Administrative Group (FYDIBOHF23SPDLT)'.
[03/09/2011 17:04:00.0557] [1] 0.  ErrorRecord: Microsoft.Exchange.Data.Directory.SystemConfiguration.DefaultAdministrativeGroupNotFoundException: Could not find the default Administrative Group 'Exchange Administrative Group (FYDIBOHF23SPDLT)'.
   at Microsoft.Exchange.Data.Directory.SystemConfiguration.ADSystemConfigurationSession.GetAdministrativeGroup()
   at Microsoft.Exchange.Data.Directory.SystemConfiguration.ADSystemConfigurationSession.GetAdministrativeGroupId()
   at Microsoft.Exchange.Management.SystemConfigurationTasks.NewExchangeServer.PrepareDataObject()
   at Microsoft.Exchange.Configuration.Tasks.SetTaskBase`1.InternalValidate()
   at Microsoft.Exchange.Configuration.Tasks.Task.ProcessRecord()
[03/09/2011 17:04:00.0573] [1] The following error was generated when "$error.Clear();
          if ($server -eq $null)
          new-exchangeserver -DomainController $RoleDomainController -Name $RoleNetBIOSName
        " was run: "Could not find the default Administrative Group 'Exchange Administrative Group (FYDIBOHF23SPDLT)'.".
[03/09/2011 17:04:00.0573] [1] Could not find the default Administrative Group 'Exchange Administrative Group (FYDIBOHF23SPDLT)'.
[03/09/2011 17:04:00.0573] [1] [ERROR-REFERENCE] Id=ProvisionServerComponent___84489810458648f5ac6e47811394a284 Component=EXCHANGE14:\Current\Release\Shared\Datacenter\Setup
[03/09/2011 17:04:00.0573] [1] Setup is stopping now because of one or more critical errors.
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is you think that manual deletion is the issue, please go to ADIEDIT.msc and check whether ur able to see the AG there
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Update, this is what is happening to me now (from another experts-exchange questions)

"Database is mandatory on UserMailbox error during install of Hub Transport"

Another suggestion was to try installing the other roles prior to the Hub Transport Role, so I also tried that. The Mailbox Role installed fine with no errors, as did the Client Access Role.

I then tried to install the Hub Transport Role again, and it worked! Rebooted server and then opened the Exchange Management Console, and voila, there it is, it appears we have Exchange 2010 again.

EXCEPT, now the mailbox role is failing with "Database is mandatory on UserMailbox. Property Name: Database".

I've tried deleting the FederatedEmail user account (per here, but when I go to recreate the account it fails.

This is another link regarding the issue -

It states I need to manually add a exchange db to the homeMDB for CN=FederatedEmail.4c....

How I'm I suppose to manually add a db value to homeMDB when no Exchange 2010 db has been created??
also /ps /preparead /pad

got me past the first error I posted about not being able to find the storage group.
have u tried deleting the water mark key and installing it again ??

teh above link has a pic which shows where the water mark key is present
HKLM\Software\Microsoft\Exchange\v14.0\<name of role>.
I'm not seeing that value (see image)
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found my own solution!