This document explains how to fix Microsoft Windows error code 80070646 or 0x80070646 if it is not working properly or throwing an error while installing, updating or upgrading Windows.

The error message may look like:
– Windows could not search for new updates. An error occurred while checking for new updates for your computer.
– Some updated were not installed. Failed: 35 updates -KB2680317

Error(s) found: Code 80070646 Windows update encountered an unknown error.

This solutions applies for following version of Microsoft Windows:

  • Windows 7
  • Windows 8
  • Windows 8.1
  • Windows 10
Error 80070646 Windows Update Overview
Avg. Time to Resolve Issue   30 mins
Difficulty Hard
Log Name: MicrosofWindowsUpdateError8287.log
Source: System
Event ID: 6128
Operating System
  • Windows 7
  • Windows 8
  • Windows 8.1
  • Windows 10
Level: Warning
User: Admin
  • Faulting Application Name: Window Update Manager , version: 5.0.2925.75694, time stamp: 0×60943507
  • Faulting module name: Windows  update.dll, version: 2.2.3688.21137
  • Exception code: 0xa09b195e
  • Fault offset: 0xd02c883e
  • Faulting process ID: 0×552
  • Faulting application start time: 0x800b0d08004521
  • Faulting application path: ~<userpath>
  • Faulting module path: ~C:\Windows\System32
  • Report ID: g8b86f12-2445-71c3-9341-9346gfb5b374
Also Known as
  • WindowsUpdate_80070646
  • 80070646
  • WindowsUpdate_80070646e
  • 80070646e
  • 0x80070646
  • fehler code 80070646, foutcode 80070646, fejlkode 80070646, code d’erreur 80070646, codice di errore 80070646, feil kode 80070646, cod de eroare 80070646, código de error 80070646

Cause of 80070646 Windows Update Error Code

  • Application Conflict
  • Microsoft Windows internal Application Conflict

How to Resolve Windows Error Code 80070646

Step 1: Check Windows Firewall
1. Press Windows Key + R and Enter Firewall.cpl
2. Click OK.

3. Click on “Turn Windows Firewall On or Off
Turn Windows Firewall on or off4. In Private network Setting, select “Turn off Windows firewall (not recommended)
5. Do the same for Public Network Setting.
Disable Windows Firewall6. Press OK.
Note: After the issue is resolved you must turn the Windows Firewall on.

Step 2: Temporarily Disable any installed 3rd Party Antivirus

Some times Antivirus/Malware/Adware programs mark Microsoft Windows installer files as Spam and block it from installing. Please refer your vendors website for disabling it temporarily. Once installation is done you can activate it again.

In most cases Microsoft Windows update error code 80070646 should be resolved by following above steps. If however the issue still persists it means there is some critical issue with your system which needs to be fixed manually and is recommended to be done by an experienced Computer Technician.

You can chat one-on-one with one of our Microsoft Certified Support Representative 24/7 by clicking on the Chat button.

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Last Updated: 18/02/2016
Solution ID: 974444

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  • April 13th, 2016

    Posted In: Microsoft Windows

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