Windows update error 0x800700c1

Hi Dave

I've checked and it's windows version 2004 and the update is 'Windows 10, version 21H2'.

I ran the trouble shooter and it found a problem but didn't resolve it.

I also input this into the command prompt as an administrator and it didn't work:

dism /online /cleanup-image /restorehealth
sfc /scannow

Thanks

Hello DL, I'm Greg, 10 years awarded Windows MVP, here to help you.

I will give you all possible steps to troubleshoot Windows installation failure that I've given to thousands of others in this situation and which work in about 90% of cases. If not we'll go from there:

Follow the gold standard Clean Install steps in this tutorial which compiles the best possible install that will stay that way as long as you stick with the tools and methods given: http://answers.microsoft.com/en-us/windows/wiki...

Make sure all other drives and peripherals are unplugged. Update the BIOS or UEFI firmware to latest, or reset to Defaults, making sure (if you have it) UEFI is enabled, CSM or Legacy BIOS disabled, Windows Boot Manager set first to boot, if necessary disable Secure and Fast Boot until after install, set SATA controller to AHCI, Save changes and Exit. Access BIOS/UEFI Setup as shown here: https://www.mydigitallife.net/comprehensive-lis... https://www.groovypost.com/howto/reset-pc-bios-...

Create the latest Windows 10 Installation Media by installing Media Creation Tool and following the directions here: http://windows.microsoft.com/en-us/windows-10/m....

If you're using another PC to do this uncheck the box for Recommended Settings to choose the exact version and bit rate for the target PC only. Insert media, boot it by powering up PC while pressing the BIOS Boot Menu Key: https://www.sysnative.com/forums/hardware-tutor...

If the media won't boot you may need to enter BIOS/UEFI Setup (pressing key given in chart in link above) to turn off Fast Boot or Fast Startup first. If you can start Windows enter UEFI firmware here: http://www.isunshare.com/windows-password/four-...

The media may also be bad, so confirm it boots and queues up per these steps in another PC, or else recreate it. You can also try a DVD, or the alternate download site from MS TechBench here: https://tb.rg-adguard.net/public.php. Burn to DVD using WIndows Image Burner or create bootable flash using one of the options here: https://www.tenforums.com/tutorials/2376-create...

Choose the boot device as a UEFI device if offered, on first screen press Shift + F10 to open a Command Prompt, type the following commands, each followed by Enter key:

DISKPART

LIST DISK

SEL DIS # (replace # with the disk # of the Windows disk from list in previous command)

CLEAN

EXIT

Close Command Box, on second screen choose Install Now, then Custom Install, then at the drive selection screen choose Unallocated Space, click Next to let it create needed partitions and start install - this makes it foolproof.

Make sure to follow the setup steps in the first link tutorial to complete your install. Drivers are important enough that those steps are printed in red. If installation stalls or won't complete, try disconnecting from the internet. You will get and keep the best possible install to the exact extent you stick with the steps, tools and methods in the first linked tutorial. It's a better install than any amount of money could buy and a great learning experience that will make you the master of your PC.

Failures and errors during the Setup phase can often be overcome by disconnecting from the internet, e.g. unplug router.

If all else fails you can move the hard drive to another PC to do the install with it plugged in alone. Windows 10 is remarkably adaptive to new hardware without needing adaptive restore. If it will start it will swap out all drivers requiring several restarts. You can also try applying a same-version System Image to the intact SSD/hard drive.

Please report back the results of each step so I know what else to suggest.

______________________________________________

Standard Disclaimer: There are links to non-Microsoft websites. The pages appear to be providing accurate, safe information. Watch out for ads on the sites that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the sites before you decide to download and install it.

Hi DLMCB,

I am Dave, I will help you with this.

1

Open the Settings App (gear icon on your Start Menu)

Go to Update and Security - Troubleshoot

Click 'Show Additional Troubleshooters'

Run the Windows Update troubleshooter from the resulting page

2

If that does not get the update service working on your PC

Click your Start Button, type winver and hit Enter

On the resulting dialog, what Version No. and build No. of Windows 10 are you running?

3

Open the Settings App (gear icon on your Start Menu)

Go to Update and Security - Windows Updates

What update(s) are showing as pending on your system?

Thanks - I've now tried to download that and it is saying there is a network issue?

Hi DLMCB,

With these major upgrades, the most successful method is to upgrade from the Windows 10 ISO - you download the ISO and then perform an Offline Upgrade

Please Note, follow the steps, this is then just an update and your files and applications will remain untouched.

Click this link:

https://www.microsoft.com/en-us/software-downlo...

to download the Media Creation Tool (Click on Download Tool Now), with that you can download the latest Windows 10 ISO (Select Create Installation Media for Another PC), then choose ISO, not USB

When the ISO file completes downloading

Disconnect from the Internet

Temporarily disable any 3rd party Anti-virus you may have installed

Then, in Windows File Explorer, double click the ISO and then run Setup.exe and select the upgrade option.