Why did I get error 0x800404A0?
Windows Update continous fails to search for Updates or cannot install them. The source of this problem could be various things as
> Windows Registry
> Windows Filesystem
> Internet access
> Windows Update service
> File corruption
> Misconfiguration
> Adware
> Virus and Malware
> Windows Filesystem
> Internet access
> Windows Update service
> File corruption
> Misconfiguration
> Adware
> Virus and Malware
How to fix Windows Update error 0x800404A0?
1. Click Start and start typing on your keyboard for "services.msc"
2. In your search results "services.msc" should show up. Open it with a click.
3. A new windows will open containing all Windows services on your system.
4. Search for "Windows Update"
5. Right-click the "Windows Update" and then click Stop.
We will now clean the Windows Update temporary cache folder:
1. Hold your windows-key pressed and hit "R" key simultanous.
2. A small new windows will appear.
3. Type %windir%\SoftwareDistribution\DataStore in this new window and click OK.
4. This will open Windows Explorer on the correct location.
5. Delete all contents of this folder. (Hint: Use Ctrl + A to select all files and folders)
2. A small new windows will appear.
3. Type %windir%\SoftwareDistribution\DataStore in this new window and click OK.
4. This will open Windows Explorer on the correct location.
5. Delete all contents of this folder. (Hint: Use Ctrl + A to select all files and folders)
Now we will start the Windows Update Service again:
1. Switch back to the windows Services.
2. Locate Windows Update.
3. Right-click on it and choose Start.
2. Locate Windows Update.
3. Right-click on it and choose Start.
If the problem still persists, you can run the System File Checker (SFC) utility. This handy in-built tool will check your filesystem.
1. Click Start and start typing on your keyboard for "cmd".
2. In your search results cmd should show up with an black icon.
3. Right-click it and select Run as administrator.
4. If you are prompted for the admin password, enter the password and click OK.
5. A new completely black windwos will open. You can type commands directly into this window.
6. Type sfc/scannow and press Enter.
7. This process will take a long time. You can minimize this black windows and work on.
2. In your search results cmd should show up with an black icon.
3. Right-click it and select Run as administrator.
4. If you are prompted for the admin password, enter the password and click OK.
5. A new completely black windwos will open. You can type commands directly into this window.
6. Type sfc/scannow and press Enter.
7. This process will take a long time. You can minimize this black windows and work on.
As soon as the SFC process finished, restart your computer. After the restart you search for Updates again.
You are still facing the same issue?
1. Restart your computer.
Next thing is to clean Windows Update download path. These steps are only for expirienced user! If you mess up your computer with Regedit, you could loose your files! Take care or use a professional tool to investiagte your computer.
1. Hold your windows-key pressed and hit "R" key simultanous.
2. A small new windows will appear.
3. Type regedit in this new windows and hit Enter.
4. In the new windows you have a navigation on the left side. Use it to navigate to
6. If they are not listet we cannot clean the download path. Othwerwise delete both.
7. Restart your computer.
2. A small new windows will appear.
3. Type regedit in this new windows and hit Enter.
4. In the new windows you have a navigation on the left side. Use it to navigate to
HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate
5. Once you found it, search for WUServer and WIStatusServer in the right hand pane.6. If they are not listet we cannot clean the download path. Othwerwise delete both.
7. Restart your computer.
Try to search for new Updates again.
You are still facing this issue? I think this is not an usual problem and your computer should be checked by professional.
Try to look for a solution here or search further in the search box below.
Advanced information
The following Windows verisons are affected by this error:
> Windows Vista
> Windows 7
> Windows 8
> Windows 8.1
> Windows 10
> Windows 10 Redstone 2
> Windows 10 Creators Update
> Windows Server 2008 R2
> Windows Server 2012
> Windows Server 2016
> Windows 7
> Windows 8
> Windows 8.1
> Windows 10
> Windows 10 Redstone 2
> Windows 10 Creators Update
> Windows Server 2008 R2
> Windows Server 2012
> Windows Server 2016
Configuration System Failed retrieve const public 0x4a03c810 0x00100000 0x480350cf 0x59a800cf 0x84000540 IDSINVALIDTLSMNGR Escaped 0x800404A2 0x4a03c811 0x800404A1 0x05000004 0x0541faf0 0x82040c00 0x60c01000 FreeBSD 0x4803543e 0x50000000 0x8c000502 0x600400de 0x00115aa4 0x4807500b size instance managed Cannot create 0x8004049F 0x8004049D proxy IDSFAILEDCREATEMANAGEDPROXY privileges IDSFAILEDRETRIEVEPRIV expected IDSINVALIDESCAPEDXML 11042016 0x60001802 lists mailing Lemmen 0x4807503d devispfwasm2500h code 0x480f529f File Source headsysdevispfw 0x6447c829 2009 Dynamics 0x0501ff96 0x0010daa9 0x59e40001 Ronald r297818 commit 0x900d0420 Manager device Rethread position ErrorCodescs specification EZNCDATARETHREADWRITENODATA 0x80040BA3 Synchronize using change 05032016 with external systems axis Communication Software FCSB1224W000 0x80004001 0x800404A3 MITSUBISHI EZNCDATAMDLREGISTREAD Writeonly EZNCDATAMDLREGISTAXIS Invalid Data readable EZNCDATAMDLREGISTWRITEONLY 0x8004049C C12ServiceResponseNETT C12ServiceResponseNETR Class Reference C12ServiceResponseUAT 0x8004049E C12ServiceResponseSGERR kernel ISPFW C12ServiceResponseRQTL C12ServiceResponseRSTL C12ServiceResponseSGNP MErrorEnum 2147220320 unManagedproxycreationfailed uncheckedint0x8004049f 2147220319 unManagedunabletoretrieveprivileges uncheckedint0x800404a0 2147220321 C12Adapter Opensource Interface unManagedinvalidprincipal uncheckedint0x8004049e 2147220322