I have also tried downloading Service Pack 1 manually from the Windows website, but a few seconds after I click the install button, I get an error. It doesn't seem that there is any way out of this (other than to reformat, obviously). It's disappointing that I can't play this game just because I don't have the most up-to-date service pack. Can anyone think of any other way to upgrade my service pack? I'm at a loss.