FileNotFoundException error when installing SharePoint 2010 Beta

On a Windows Server 2008 R2 installation which passed all the prerequisites, you might get the following error :

11/17/2009 16:39:32 9 ERR Exception: System.IO.FileNotFoundException: Could not load file or assembly 'Microsoft.IdentityModel, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.
File name: 'Microsoft.IdentityModel, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'
at Microsoft.SharePoint.Administration.SPFarm.CurrentUserIsAdministrator(Boolean allowContentApplicationAccess)
at Microsoft.SharePoint.Administration.SPConfigurationDatabase.Microsoft.SharePoint.Administration.ISPPersistedStoreProvider.DoesCurrentUserHaveWritePermission(SPPersistedObject persistedObject)
at Microsoft.SharePoint.Administration.SPPersistedObject.BaseUpdate()
at Microsoft.SharePoint.Administration.SPFarm.Update()
at Microsoft.SharePoint.Administration.SPConfigurationDatabase.RegisterDefaultDatabaseServices(SqlConnectionStringBuilder connectionString)
at Microsoft.SharePoint.Administration.SPConfigurationDatabase.Provision(SqlConnectionStringBuilder connectionString)
at Microsoft.SharePoint.Administration.SPFarm.Create(SqlConnectionStringBuilder configurationDatabase, SqlConnectionStringBuilder administrationContentDatabase, IdentityType identityType, String farmUser, SecureString farmPassword, SecureString masterPassphrase)
at Microsoft.SharePoint.Administration.SPFarm.Create(SqlConnectionStringBuilder configurationDatabase, SqlConnectionStringBuilder administrationContentDatabase, String farmUser, SecureString farmPassword, SecureString masterPassphrase)
at Microsoft.SharePoint.PostSetupConfiguration.ConfigurationDatabaseTask.CreateOrConnectConfigDb()
at Microsoft.SharePoint.PostSetupConfiguration.ConfigurationDatabaseTask.Run()
at Microsoft.SharePoint.PostSetupConfiguration.TaskThread.ExecuteTask()WRN: Assembly binding logging is turned OFF.
To enable assembly bind failure logging, set the registry value [HKLM\Software\Microsoft\Fusion!EnableLog] (DWORD) to 1.
Note: There is some performance penalty associated with assembly bind failure logging.
To turn this feature off, remove the registry value [HKLM\Software\Microsoft\Fusion!EnableLog].

To resolve the problem you will need to download the following Geneva Framework version that had the required DLL.