Method 1: Confirm that Windows 7 SP1 is not already installed and that you are not running a prerelease version of Windows 7 SP1 To resolve this issue, follow the steps in the methods below starting with Method 1, if method 1 does not resolve the issue, go to method 2.
System files that are required to install Windows 7 SP1 are missing from your computer.
To help avoid these scenarios, Windows 7 SP1 is not offered through Windows Update if any of the following issues are true for your computer:: There are certain scenarios where the installation of Windows 7 SP1 may not be successful. When you use Windows Update to check for updates, you may not be offered the option of downloading Windows 7 Service Pack 1 (SP1). You do not have the option of downloading Windows 7 SP1 when you use Windows Update to check for updates
