Fix Windows Update error 0x80070661

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Here's how to Fix Windows Update error 0x80070661.


Error code 0x80070661 in Windows Update usually indicates that a file or registry key required for the update process is missing or corrupted. Here are some steps you can take to fix this error:

1. Run the Windows Update Troubleshooter:

Go to Settings - Update & Security - Troubleshoot.
Click on Windows Update, then click Run the troubleshooter.
Follow the on-screen instructions to detect and fix any issues.

2. Restart the Windows Update services:

Open the Command Prompt as Administrator.
Type "net stop wuauserv" and hit Enter.
Type "net stop cryptSvc" and hit Enter.
Type "net stop bits" and hit Enter.
Type "net stop msiserver" and hit Enter.
Type "ren C:\Windows\SoftwareDistribution SoftwareDistribution.old" and hit Enter.
Type "ren C:\Windows\System32\catroot2 catroot2.old" and hit Enter.
Type "net start wuauserv" and hit Enter.
Type "net start cryptSvc" and hit Enter.
Type "net start bits" and hit Enter.
Type "net start msiserver" and hit Enter.

3. Manually reset Windows Update components:

Open the Command Prompt as Administrator.
Type "net stop wuauserv" and hit Enter.
Type "net stop cryptSvc" and hit Enter.
Type "net stop bits" and hit Enter.
Type "net stop msiserver" and hit Enter.
Type "ren C:\Windows\SoftwareDistribution SoftwareDistribution.old" and hit Enter.
Type "ren C:\Windows\System32\catroot2 catroot2.old" and hit Enter.
Type "net start wuauserv" and hit Enter.
Type "net start cryptSvc" and hit Enter.
Type "net start bits" and hit Enter.
Type "net start msiserver" and hit Enter.
Close the Command Prompt and restart your computer.

4. Check your antivirus software:

Temporarily disable your antivirus software.
Retry the Windows update process.
Re-enable your antivirus software after the update is complete.

5. Perform a System File Checker scan:

Open the Command Prompt as Administrator.
Type "sfc /scannow" and hit Enter.
Wait for the scan to complete.
Restart your computer.

If none of the above steps work, you can also try to manually download and install the update from the Microsoft Update Catalog website.