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Install Windows 7 Service Pack 1 (SP1) - Windows Help
Go to the Windows 7 Service Pack 1 download page on the Microsoft website. Select Install Instructions to see which packages are available for download, and make note of the one that you need.; Select the appropriate language from the drop-down list, and then select Download.; Select the packages you need to install, select Next, and then follow the instructions to install SP1.
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