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This topic provides a brief introduction to Windows 10 installation processes, and provides resolution procedures that IT administrators can use to resolve issues with Windows 10 upgrade.
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If you are not an IT administrator, you can try the [quick fixes](#quick-fixes) listed in this topic.
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## In this topic
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The following sections and procedures are provided in this guide:
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The following steps can resolve many Windows upgrade problems.
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<OL>
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<LI>Remove nonessential external hardware, such as docks and USB devices.</LI>
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<LI>Check all hard drives for errors and attempt repairs. To automatically repair hard drives, open an elevated command prompt, switch to the drive you wish to repair, and type the following command. You will be required to reboot the computer if the hard drive being repaired is also the system drive.
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<UL>
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<LI>chkdsk /F</LI>
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<LI>Verify compatibility information and re-install antivirus applications after the upgrade.</LI></LI>
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</UL>
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<LI>Uninstall all nonessential software.</LI>
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<LI>Remove nonessential external hardware, such as docks and USB devices.</LI>
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<LI>Update firmware and drivers.</LI>
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<LI>Ensure that "Download and install updates (recommended)" is accepted at the start of the upgrade process.</LI>
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<LI>Verify at least 16 GB of free space is available to upgrade a 32-bit OS, or 20 GB for a 64-bit OS.
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</OL>
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## Upgrade error codes
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If the upgrade process is not successful, Windows Setup will return two codes:
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