This document explains how to fix Microsoft Windows error code C1420127 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.
– Windows 10 couldn’t be installed
– Some updated were not installed. Failed: 93 updates
-KB3035583 , KB2976978.
Error(s) found: Code C1420127 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 C1420127 Windows Update Overview
Avg. Time to Resolve Issue   50 mins
Difficulty Critical
Log Name: MicrosofWindowsUpdateError7673.log
Source: System
Event ID: 4866
Operating System
  • Windows 7
  • Windows 8
  • Windows 8.1
  • Windows 10
Level: Warning
User: System
  • Faulting Application Name: Window Update Manager , version: 5.6.7208.12426, time stamp: 0×61105283
  • Faulting module name: Windows  error.dll, version: 4.5.6983.22895
  • Exception code: 0xd05b890e
  • Fault offset: 0xd01e252a
  • Faulting process ID: 0×025
  • Faulting application start time: 0x800d5f25514342
  • Faulting application path: ~<userpath>
  • Faulting module path: ~C:\Windows\System32
  • Report ID: e9f88d16-2113-57b5-9518-1659eea5b551
Also Known as
  • WindowsUpdate_c1420127
  • C1420127
  • WindowsUpdate_C1420127e
  • C1420127e
  • 0xC1420127
  • fehler code C1420127, foutcode C1420127, fejlkode C1420127, code d’erreur C1420127, codice di errore C1420127, feil kode C1420127, cod de eroare C1420127, código de error C1420127

Cause of C1420127 Windows Update Error Code

  • System is infected with Virus/Adware
  • System DLL files conflict

How to fix Windows Error C1420127

Step 1: 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.

Step 2: Check System Integrity

1. Press Windows Key + R and Enter “CMD” (without quotes)
2. Press OK.
open command prompt3. In command Prompt Copy following commands (Simply select the command and press Ctrl+C and press Ctrl+V in command prompt)

 sfc /scannow 

sfc scannow
The system will take some time to check. Let it run for a while. If it finds any issues in “os” integrity it will automatically fix it.

Note: You will need Administrator Access to Run the above command. Simply Right Click on CMD button and select “Run as Administrator

 You can contact our 24×7 customer Live Technician for any help during the whole process. 

In most cases Microsoft Windows update error code C1420127 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.

Rate this Solution
Did this article help you?
99   1      
Last Updated: 18/02/2016
Solution ID: 776857

  • Windows Update Error 800700003 | How to fix Steps
  • Windows Update Error 80040154 | How to fix Steps
  • Windows Update Error 0x8024a206 | How to fix Steps
  • Windows Update Error 0xc80001fe | How to fix Steps
  • Windows Update Error 8024401f | How to fix Steps
  • Windows Update Error 0x80070002-0x20009 | How to fix Steps
  • Windows Update Error 0x80240036 | How to fix Steps
  • Windows Update Error 0x8024201c | How to fix Steps
  • Windows Update Error 8007002c-2000d | How to fix Steps
  • Windows Update Error c1900204 | How to fix Steps
  • April 13th, 2016

    Posted In: Microsoft Windows

    LiveZilla Live Chat Software