Error encountered moving TFS2010 to a new server

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http://serverfault.com – I'm attempting do a test move of our TFS2010 server and I'm encountering an error. I've got a new Server 2008 R2 and SQL Server installation as on the current server and I've turned off the services and backed up the databases on the old one. All processes running as the same account as the previous server. I've then restored the databases on the new server and I'm attempting to run the "Application-Tier Only" wizard as the documentation suggests. A I'm expecting to be able to select the tfs_configuration database but the error message I get is: "TFS254006: No usable accounts are present in (HowTos)