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The Windows Update Error 0x800f0805 typically occurs when Windows fails to download or install an update, such as KB5053606 or KB5053643. This error usually points to issues related to missing update dependencies, system file corruption, or Windows Update component failures. Below are the common causes:

1. Corrupted Windows Update Files
If the update files in SoftwareDistribution or Catroot2 folders are incomplete or damaged, Windows cannot process them properly.

This often happens due to interrupted downloads or storage issues.

2. Missing Required Updates (Dependency Issues)
Some updates require previous updates to be installed first.

If KB5053606 or KB5053643 depends on an earlier update that is missing or failed to install, this error can occur.

3. Windows Update Components Are Malfunctioning
Services like Windows Update (wuauserv), BITS (Background Intelligent Transfer Service), or Cryptographic Services may be disabled or misconfigured.

If these services aren’t running correctly, Windows cannot verify or apply the update.

4. System File Corruption
Critical Windows system files needed for the update process might be damaged.

Corruption in system files prevents Windows from validating and installing updates.

5. Insufficient Disk Space
If your system drive (C:) is running low on space, Windows might not be able to download or extract the update files properly.

6. Third-Party Antivirus or Firewall Interference
Some security programs block Windows Update processes, mistakenly identifying them as a threat.

Overprotective firewall settings can prevent Windows from downloading update files.

7. Network Connectivity Issues
A slow or unstable internet connection can interrupt the update download, leading to a failed installation.

Using a VPN or proxy may also cause update failures.

How to Fix Windows 10 Update KB5053606 / KB5053643 Error 0x800f0805
1. Run the Windows Update Troubleshooter
Open Settings - Update & Security - Troubleshoot.

Click on Windows Update and select Run the troubleshooter.

Follow the prompts and restart your PC.

2. Reset Windows Update Components
Open Command Prompt (Admin).

Run the following commands one by one:

Edit
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
Restart your PC and try updating again.

3. Run SFC and DISM Scans
Open Command Prompt (Admin).

Run:

sfc /scannow
DISM /Online /Cleanup-Image /RestoreHealth
Restart your PC and retry the update.