Fixing Windows Update Error Code 0x80071a91: Step-by-Step Guide

Fixing Windows Update Error Code 0x80071a91: Step-by-Step Guide

1. Reset the File System Resource Manager

Open an elevated Command Prompt (Right-click the Start button and select "Windows Terminal (Admin)").
Run this command CMD/bash:
```
fsutil resource setautoreset true C:\
```
(Replace C: with your Windows installation drive, if different.)
Restart your PC to apply the changes.

2. Clear Outdated Update Files

Go to: C:\Windows\SoftwareDistribution\Download.
Delete everything inside the folder.
Restart services like:
- Windows Update
- BITS (Background Intelligent Transfer Service)
- Cryptographic Services (CryptSvc)

3. Use the Windows Update Troubleshooter

Open Settings > Update & Security > Troubleshoot > Additional troubleshooters.
Click on Windows Update, then run the troubleshooter and follow the prompts.

4. Scan for System File Corruption

Launch Command Prompt as Administrator.
Run the System File Checker CMD/bash:
```
sfc /scannow
```
Then, use the DISM tool to restore system health:
```
DISM /Online /Cleanup-Image /RestoreHealth
```
(Requires internet access)

5. Temporarily Disable Third-Party Security Software

Disable any external antivirus or firewall software that might be blocking update processes.
After updating, you can re-enable your protection.

6. Check for Damaged Update Cache

The SoftwareDistribution and Catroot2 folders hold update data:
- Delete the contents of SoftwareDistribution\Download.
- Rename Catroot2 to something like Catroot2.old; Windows will recreate it.

7. Perform a Repair Installation of Windows

If none of the above steps work, use the Media Creation Tool from Microsoft’s website to perform a repair install.
This process will reinstall Windows 10 without affecting your personal files.

Comments