Windows 10 Won't Install

It goes all the way and then it gives me an error code:

0x800F0830 - 0x20003

"The installation failed in the SAFE_OS phase with an error during INSTALL_UPDATES operation.

I have tried this seven (7) times and it just reverts back to Windows 7.

Any help would be greatly appreciated. Joe

Microsoft recently released updates for Windows 7 and Windows 8.1 improving the stability of the upgrade experience for Windows 10. Please ensure you have the update installed for your respective version of Windows:

KB3112343 for Windows 7 and KB3112336 for Windows 8.1


Pre-requisite Task

When making significant changes to your computer such as updating the operating system, you should always backup. See links to resources about backing up by clicking the link for the respective version of Windows you are running: Windows XP, Windows Vista, Windows 7, Windows 8/8.1



  • Disable (preferrably uninstall) your Antivirus utility before attempting the upgrade.
  • Restart a few times and try again.
  • Disable General USB Devices (example - Smart Card Reader). 
  • If you are using a SCSI hard disk, make sure you have drivers available for your storage device on a thumdrive and it is connected. During Windows 10 setup, click the Custom Advanced Option and use the Load Driver command to load the appropriate driver for the SCSI drive. If this does not work and setup still fails, consider switching to a IDE based hard disk.
  • Do a clean boot and try again.
  • If you are upgrading using the .ISO file, disconnect from the Internet during setup, if you are connected by LAN (Ethernet) or Wi-Fi, disable both and attempt setup again. 
  • If you are updating through Windows Update, when the download reaches 100% disconnect from the Internet LAN (Ethernet) or Wi-Fi and proceed with the installation.
  • If that does not work, try using the .ISO file to upgrade if possible.
  • If you are connected to a domain, switch to a local account
  • If you have any external devices attached to the machine, disconnect them (example, gaming controllers, USB keys, external hard disk, printers, non-essential devices).

    How to: upgrade from previous versions of Windows using Windows 10 ISO file

    How to download official Windows 10 ISO files

    If you are installing Windows 10 using Windows Update, try the following:

    1. Press Windows Key + X on the keyboard and then select “Command Prompt (Admin)” from the menu.

    2. Stop the BITS, Cryptographic, MSI Installer and the Windows Update Services. To do this, type the following commands at a command prompt. Press the “ENTER” key after you type each command.

                               net stop wuauserv

                               net stop cryptSvc

                               net stop bits

                               net stop msiserver

    3. Now rename the SoftwareDistribution and Catroot2 folder. You can do this by typing the following commands in the Command Prompt. Press the “ENTER” key after you type each command.

                              ren C:\Windows\SoftwareDistribution SoftwareDistribution.old

                              ren C:\Windows\System32\catroot2 Catroot2.old

    4. Now, let’s restart the BITS, Cryptographic, MSI Installer and the Windows Update Services. Typethe following commands in the Command Prompt for this. Press the ENTER key after you type each command.

                            net start wuauserv

                            net start cryptSvc

                            net start bits

                            net start msiserver

    5. Type Exit in the Command Prompt to close it and then restart the computer.

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MVP-Windows and Devices for IT

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Question Info

Last updated December 29, 2017 Views 241 Applies to: