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Windows Update / Windows Defender gives error 0x8024401C

We see this error typically when there is a network connectivity problem between Windows Update or Windows Defender, and Microsoft’s servers. This problem can occur even when the machine in question has access to the internet, if there is a problem with the windows firewall, erroneous proxy settings, or a corrupted Windows Update database.

For Windows 8, or 8.1, Microsoft has an automated tool that can help check on the status of the database, and in some cases resolve the issue outright. This tool can be found at : Microsoft Source : http://windows.microsoft.com/en-us/windows-8/windows-update-error-0x8024401c

If this automatic tool fails to resolve the problem, attempt the following :

WindowsUpdateFailed-Troubleshooting-Steps

 

 

 

 

 

 

 

 

 

  1. Open an Elevated Command Prompt
  2. Type “SFC /scannow” – this will check your windows system files for corruption and repair if possible. If corruption is found, troubleshoot further into hardware failure issues.
  3. Bring up a control panel, and select internet options
  4. In internet options, select “connections”. On the connections screen select “LAN Settings”
  5. Ensure under LAN Settings, the ‘Automatically Detect Settings’ box is checked.
  6. Hit OK, exit out. Reboot if needed, and attempt to update windows again. Problem should be resolved.

How To : Open an “Elevated Command Prompt”

Elevated command prompts are often used to carry out tasks with full administrator rights to your computer. In most cases, you will not want to execute programs with administrator rights, as it opens your system up to security vulnerabilities. Typically you would want to check with your network support professional for help before proceeding with the below.

Windows 7

  1. Open Start Menu
  2. In search box, type ‘cmd’
  3. Right click the CMD program, and select ‘Run as administrator’

how-to-open-elevated-command-prompt

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Windows 8

  1. Open search screen, using start menu or ‘Charms’ on right hand side of the screen
  2. In search box, type ‘cmd’
  3. Right click the ‘Command Prompt’ program, and select ‘Run as administrator’

how-to-windows-8-elevated-command-prompt


Deleting files from old Offline File Cache in Windows 7 or XP

As network support providers, we frequently come across come across scenarios where a computer on a business domain has a user profile that has old Offline File Cache data in it. Typically, the user account has moved to a new domain, or is pointing to an old server path, no longer in use. This can happen if the user account has redirected folders enabled on the My Documents or Desktop folders – and the server is no longer in use, or unreachable. This can result in low disk space, or in many cases, duplicate files.

You also may need to delete your offline file cache if you are receiving the error message : “Unable to merge offline changes on \\server_name\share_name. The parameter is incorrect.” in your sync center.

Fortunately, the fix is relatively simple.

Windows 7

Open an elevated command prompt (Start -> type CMD in search box -> Right Click, Run as Administrator)

type : “REG ADD “HKLM\System\CurrentControlSet\Services\CSC\Parameters” /v FormatDatabase /t REG_DWORD /d 1 /f”

Reboot computer – the Client Side Cache will be cleared on your next login.

THIS WILL DELETE ALL CACHED OFFLINE FILES – DATA WILL NOT BE RECOVERABLE, ENSURE YOU HAVE BACKUPS IN PLACE.

Microsoft’s Notes :

Make sure that files are synchronized before you add this registry entry. Otherwise, unsynchronized changes will be lost.
The actual value of the new registry key is ignored.
This registry change requires a restart. When the computer is restarting, the shell will re-initialize the CSC cache, and then delete the registry key if the registry entry exists.

Windoes 7 Reference : http://support.microsoft.com/kb/942974

 

If you have Windows XP, follow this procedure : http://support.microsoft.com/kb/230738


Windows won’t start after Microsoft Update installation

Windows won’t start after update installation

This is a common problem we run in to while providing IT support with older computers. After applying a Microsoft Update patch, windows will partially boot, or not boot at all. Most of the times, windows will boot to its start screen, with a message similar to the below :

“Configuring Windows updates… 90% complete… Do not turn off your computer.”


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