Thanks, it worked, i used
ts.GetFolder("ProgressDatabaseCleaner").RegisterTaskDefinition(@"ProgressDataBaseCleaner1", td,TaskCreation.CreateOrUpdate, "SYSTEM", null, TaskLogonType.ServiceAccount);
ts.GetFolder("ProgressDatabaseCleaner").RegisterTaskDefinition(@"ProgressDataBaseCleaner1", td,TaskCreation.CreateOrUpdate, "SYSTEM", null, TaskLogonType.ServiceAccount);