This document explains how to fix Microsoft Windows error 1601 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 updates were not installed. Failed: 66 updates
– Installation can’t continue because the Windows Installer could be accessed.  Error Code 1601.
– Security Update for Microsoft. NET Framework 4
Error(s) found: Code 1601 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 1601 Windows Update Overview
Avg. Time to Resolve Issue   40 mins
Difficulty Very Hard
Log Name: MicrosofWindowsUpdateError4175.log
Source: Service Control manager
Event ID: 3307
Operating System
  • Windows 7
  • Windows 8
  • Windows 8.1
  • Windows 10
Level: System Error
User: System
  • Faulting Application Name: Window Update Manager , version: 7.3.4926.10482, time stamp: 0×53174025
  • Faulting module name: Windows  log.dll, version: 4.4.1974.51896
  • Exception code: 0xe05e577d
  • Fault offset: 0xc02c626e
  • Faulting process ID: 0×727
  • Faulting application start time: 0x800a1b31283385
  • Faulting application path: ~<userpath>
  • Faulting module path: ~C:\Windows\System32
  • Report ID: e6e89d25-2357-89g2-3648-1221eab9e972
Also Known as
  • WindowsUpdate_1601
  • 1601
  • WindowsUpdate_1601e
  • 1601e
  • 0x1601
  • fehler code 1601, foutcode 1601, fejlkode 1601, code d’erreur 1601, codice di errore 1601, feil kode 1601, cod de eroare 1601, código de error 1601

Cause of 1601 Windows Update Error Code

  • Proxy issue
  • System Level Conflict

How to fix Windows Error 1601

Step 1: Check if your network is behind Proxy
1. Hold Windows Key + R. Run Dialogue Box will open up.
2. Type CMD and Press OK.
Office Resolve Error Proxy Check 3. In command Prompt Copy following commands (Simply select the command and hold ctrl+c and press ctrl+v in command prompt)

 netsh winhttp show proxy 

Check Proxy Setting

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

If you get the message “Direct Access (no proxy server)“, continue to the next step otherwise disable proxy from Network Settings.

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

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 1601 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: 06/01/2016
Solution ID: 409117

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