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== Windows 7 Service Pack 1 Won't Install / Obtain the Full Install File ==== Obtain the Windows 7 Service Pack 1 Full Install File ==From Windows Update some users report a problem installing SP1. One common error is "Windows Update error 800B0100." This is often due to the downloaded installer in cache becoming corrupted. The next thing users attempt to do is grab the so called "network install" file which is the full install file as opposed to doing an "online install". The full install file is meant for system administrators to use on removable media or for multiple machine deployment. It is actually the best way to install a service pack, having the full file in hand. However, Microsoft has made it incredibly confusing locating the full network install for Windows 7 SP1 because of their dopey naming convention (or lack thereof) and poorly named debug files. The full install file is meant for system administrators to use on removable media or for multiple machine deployment. It is actually the best way to install a service pack, having the full file in hand. However, Microsoft has made it incredibly confusing locating the full network install for Windows 7 SP1 because of their dopey naming convention (or lack thereof) and poorly named debug files. As a final note, it is important for you to be able to identify whether or not you have the SP1 already installed, or successfully installed after your attempt to install. Press the Windows Key + R and type cmd.exe to get to a command shell. Type the command "winver" and press enter. * Version 6.1 (Build 7600) - indicates you have Windows 7 without SP1* Version 6.1 (Build 7601) - SP1 installedIf installation fails using the full install file, typically this will occur immediately, then Microsoft recommends that you download something they call the "System Update Readiness Tool." For the example 64 bit system the filename for this tool is:If [[Windows 7 Service Pack 1 Won't Install]] you will have to begin the troubleshooting process.* '''[http://download.microsoft.com/download/4/7/A/47A0F7B9-1F0F-41B0-AA42-00FD16337268/Windows6.1-KB947821-v34-x86.msu Windows6.1-KB947821-v34-x64.msu]''' - Hot fix for Windows (KB947821) updateKB is for Knowledge base with the number of the article it refers to. This tool is a misnomer in that it is nothing more than a fix for bugs in Windows 7 preventing the service pack from correctly installing on some systems. The fix is said to, "''The tool scans for inconsistencies on your computer and fixes them.''" Be patient, as this install may appear to stall or freeze, give it up to 15 or 20 minutes. Even though the progress bar may not show movement, the tool is said to be working. Furthermore, it is said, "''You can use the System Update Readiness Tool on computers that are running Windows 8, Windows 7, Windows Server 2008, Windows Server 2008 R2, and Windows Vista.'' " note: When I installed this hotfix it took about 28 minutes. The progress bar didn't move and appeared stuck at the beginning, however, after 28 minutes "Installation Complete." Make sure you have Power Management configured so your computer does not go to sleep during installation of the System Update Readiness Tool.