Install error - 0x800700c1

Hi, good day!

Can you take a screenshot of the issue and post it in your next response?

Note: Don't include any personal information or sensitive data as Microsoft Q&A is a public forum.

Please let me know if you have tried the methods below.

• Run the Windows Update Troubleshooter Open Settings > System > Troubleshoot > Other troubleshooters > Windows Update > Run troubleshooter
• Please try to run SFC and DISM to check for any system errors and corrupted files. https://support.microsoft.com/windows/using-system-file-checker-in-windows-365e0031-36b1-6031-f804-8fd86e0ef4ca Restart your computer
• Reset Windows Update components manually Press Windows keyX then select either Windows PowerShell (Admin) or Terminal (Admin) Copy each command line into Powershell or Terminal, and then press Enter (one line at a time).

      net stop bits
      net stop wuauserv
      net stop appidsvc
      net stop cryptsvc
      Del "%ALLUSERSPROFILE%\Application Data\Microsoft\Network\Downloader\*.*"
      rmdir %systemroot%\SoftwareDistribution /S /Q
      rmdir %systemroot%\system32\catroot2 /S /Q
      regsvr32.exe /s atl.dll
      regsvr32.exe /s urlmon.dll
      regsvr32.exe /s mshtml.dll
      netsh winsock reset
      netsh winsock reset proxy
      net start bits
      net start wuauserv
      net start appidsvc
      net start cryptsvc
  

• After that, restart your computer

If the issue persists, open Settings > System > Recovery.

Few things to check on the PC

• Unplug all external peripherals except for the Mouse, Keyboard, and LAN cable before starting
• Disable or uninstall any third-party Antivirus program to prevent it from interfering with the upgrade

Under Fix problems using Windows Update, click Reinstall Now

Once completed, your system will restart.

I look forward to receiving your update and I'm willing to collaborate with you till we resolve the issue. Do keep me informed by clicking "Add comment" below.

Hello,

Please run Windows Update troubleshooter from Settings app > System > Troubleshoot > Other troubleshooters. See if it works.

If that doesn't work, try this:

Open administrative Command Prompt and type following commands one-by-one followed by Enter key.

net stop wuauserv

net stop cryptSvc

net stop bits

net stop msiserver

Ren C:\Windows\SoftwareDistribution SoftwareDistribution.old

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

net start wuauserv

net start cryptSvc

net start bits

net start msiserver

Close Command Prompt and see if Windows Updates works then.

Let us know if this helps!