Install Windows 7 Service Pack 1 (SP1) - Microsoft Support
https://support.microsoft.com/en-us/windows/install-windows-7-service-pack-1-sp1-b3da2c0f-cdb6-0572-8596-bab972897f61
WEBUnder System and Security, select Fix problems with Windows Update and then follow the instructions. After the troubleshooter is done, try installing the service pack again. Learn how to install Windows 7 Service Pack 1 (SP1). Includes info about how to get the download, requirements, and more.
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