I was wondering about installing the standalone installer of SP1 for windows 7. Based on the microsoft's site, it says that it takes up a whopping 4100 MB if you use the installer, and 750 MB if you use windows update. http://windows.microsoft.com/en-US/windows7/learn-how-to-install-windows-7-service-pack-1-sp1 Is the large size for the installer because the download file plus unpacked files are left behind? Can you delete those files after installing SP1? I ask because I only have a few GB space remaining on my C: partition. Thanks in advance.