Erreur installation SCOM2012

Info: :Info:GetLocalizedAdminGroupName: Administrators Group Name is: BUILTIN\Administrateurs[11:13:09]: Error: :PopulateUserRoles: failed : Threw Exception.Type: System.UnauthorizedAccessException, Exception Error Code: 0x80070005, Exception.Message: Accès refusé. (Exception de HRESULT : 0x80070005 (E_ACCESSDENIED))[11:13:09]: Error: :StackTrace: à Microsoft.Mom.Sdk.UserRoleSetup.SetupProgram.populateUserRoles(String adminRoleGroup, String sdkAccount, InstallTypes installType, String installDirectory, Boolean overwriteExistingUsers) à Microsoft.EnterpriseManagement.OperationsManager.Setup.ServerConfiguration.PopulateUserRoles(String adminRoleGroup, String sdkAccount, String installDirPath)[11:13:09]: Error: :FATAL ACTION: PopulateUserRoles[11:13:09]: Error: :FATAL ACTION: DatabaseActions[11:13:09]: Error: :ProcessInstalls: Running the PostProcessDelegate returned false.[11:13:09]: Always: :SetErrorType: Setting VitalFailure. currentInstallItem: Database Configuration[11:13:09]: Error: :ProcessInstalls: Running the PostProcessDelegate for OMDATABASE failed.... This is a fatal item. Setting rollback.[11:13:09]: Info: :SetProgressScreen: FinishMinorStep.

http://social.technet.microsoft.com/Forums/en-US/operationsmanagerdeployment/thread/e5936efa-5f25-4d0f-9187-67469ac5ea90

I faces the same issue but when i add installation account into SQL server local administrator and grant it sql instance sysadmin role, the problem is solved.

Il faut donner les droits sysadmin au groupe BUILTIN\Administrateurs