I installed windows. I downloaded a bunch of updates. Booted my machine many times. Once all the updates installed. I go to windows update the the Optional service pack 1 update is there. So I download and install it. My machine will not boot. The repair routine starts. I can't repair it and I can't restore to an earlier time. Every attempt to restore fails. There are several restore points prior to installing service pack 1. It always fails with an error message. What are the benefits of installing service pack 1 and does it really matter?