Error 0x80070643

What Is Error Code 0x80070643

Error 0x80070643 is a Windows Installer error that commonly appears during Windows Update or Microsoft software installation. It usually indicates a failure due to corrupted system files, .NET Framework issues, or problems with the Windows Update components.

Common error messages include:

"Installation failed with error code 0x80070643"
"Windows Update encountered an error: 0x80070643"

Affected Windows Versions

• Windows 11

• Windows 10

• Windows 8.1 / 8

• Windows 7

Common Situations Where 0x80070643 Occurs

• Installing Windows Updates (especially .NET Framework, Microsoft Defender, or cumulative updates)

• Installing or updating Microsoft Office

• Installing third-party software that relies on Windows Installer

• After a failed system restore or malware cleanup

How to Fix Error Code 0x80070643 on Windows

1. ✅ Run Windows Update Troubleshooter

• Go to Settings > System > Troubleshoot > Other troubleshooters

• Click Windows Update > Run

This can automatically fix some issues with update services.

2. 🧹 Repair .NET Framework

Corrupted .NET Framework installations are a top cause of this error.

• Download and run the official .NET Framework Repair Tool from Microsoft

• Restart your PC and try updating again

Alternatively, reinstall or enable it from:

Control Panel > Programs > Turn Windows features on or off

3. 🔄 Reset Windows Update Components

Open Command Prompt (Admin) and run:

net stop wuauserv
net stop cryptSvc
net stop bits
net stop msiserver</pre>
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

Then try the update again.

4. 🔧 Repair Microsoft Office (If That’s the Issue)

If you see the error during Office updates:

• Go to Settings > Apps > Installed apps

• Find Microsoft Office > Click Modify

• Choose Quick Repair, then try Online Repair if needed

5. 🛡️ Disable Antivirus Software Temporarily

Some third-party antivirus programs can block update installers. Temporarily disable your antivirus/firewall, try the installation, then re-enable protection.

6. 🧪 Use SFC and DISM to Repair System Files

Open Command Prompt as Admin, then run:

sfc /scannow

Then run:

DISM /Online /Cleanup-Image /RestoreHealth

This fixes corrupted system files or update components.