Windows Update Install Error - 0x800700c1

Question

I've followed many forums and have taken those troubleshooting steps, but no luck. I'm hoping someone can help me directly. I have Windows 11.

Answer 1

Please run this fixlist. It sources the system modules from my GitHub page.

• Download the Farbar Scanner - https://downloads.malwarebytes.com/file/mbst-frst64 (FRST64.exe)
• Download fixlist.txt
• Save Fixlist.txt to the same folder as FRST64.exe.
• Launch the Farbar Scanner tool and click "Fix".
• Restart Windows when prompted.
• Upload the output log file (FixLog.txt) to your OneDrive.

---

Note: If Microsoft Edge or Chrome mislabels the Farbar Scanner executable as PUA/malware, choose to keep it by tapping … in the bottom bar, choosing Keep, and then choosing Keep anyway in the dialog that appears.

See this screenshot:https://learn.microsoft.com/en-us/deployedge/media/microsoft-edge-security-download-interruptions/dowload-was-blocked.png. It's a safe tool used in most antimalware forums.

Answer 2

Please see if deleting or renaming this registry key (using Regedit.exe) and rerunning those commands helps.

If 24H2 is still not offered, you may use the 24H2 ISO. See:

How to run In-place upgrade in Windows 11 - Microsoft Community:

https://answers.microsoft.com/en-us/windows/forum/all/how-to-run-in-place-upgrade-in-windows-11/4d469147-2747-4dcb-88a4-aae9273a4500

Answer 3

So I deleted that file here

Here is the new output

Should I still go through with using the 24H2 ISO?

Answer 4

The assessment has been refreshed,

If Windows Update doesn't offer 24H2, you may use the ISO to upgrade to 24H2, as there are no safeguard holds for your device.

---

Note:

If you want to remain on 23H2 and fix the update errors, try this:

Launch Settings > System > Recovery. Under "Fix problems using Windows Update", select "Reinstall now."

This does a repair installation, keeping your files, apps, and settings.

Answer 5

I decided to remain 23H2, I think I did it. I don't need to install the 24H2 version do I? Because it's got an error too