SP2 downloaded form Windows Update but failed to install properly (crashed system). I System Restored to the day before, went back to Windows Updated which shows SP2 downloaded, clicked Install but it fails to do so, gives an error message. Can't uninstall SP2 as it is not installed, can't re-download. I have downloaded all other available updates separately, the actual SP2 file download was 70MB instead of 266MB for the full kit. Ideally, I'd like to erase the download (if I can find it in its cryptic form) and re-do.