Since about the January round of Microsoft Update patches, I've had several\nmachines that stop responding at the point that the MSRT runs. I've left them\nto run for as long as an hour, and the MSRT never completes. Sometimes I can\ncancel the updates, other times I have to power off the machines. After\nrebooting and returning to the Microsoft Updates site, I can sucessfully\ncontinue to install any remaining patches, and the MSRT does not try to run\nagain. When this starts, if I look under the Processes tab in Task Manager,\nthe System process is running, without wavering, at exactly 50 percent.\n\nThese computers all run XP Pro SP3. They are all various models of Dell\nOptiplex ranging in age from one to 10 years. Out of my network of around 50\ncomputers, only about a dozen exhibit this behavior.