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This is a Step by Step
When you try to install for Windows 7 Service Pack 1 (SP1) , errors occur that prevent the installation. Use the following methods to find a solution for these installation errors.
Uninstall display languages that you do not use
Use System Restore to return your system files and settings to an earlier point in time
Use the Microsoft System Update Readiness Tool
Resolution 1 for Error 0x800F0A12
Resolution 2 for Error 0x800F0A12
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