Why did I get error 0x80040D9F?

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

How to fix Windows Update error 0x80040D9F?

However, if you’re technically savvy, you can try the steps below:

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)

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.


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.
Come back to the black window after a time and check if the process finished.
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
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
error Windows with matter remove issue problem Ways deal Tips tackle Mean best debug does troubleshoot Drivers Find methods component Simple Guidelines errors internal Update problems Event Microsoft because toremoving Ideas clear Suggestions other contains name Treat upon Xbox Video 0xc00000c7 0xc00d11cd 0xce000fdb HandypcoptimiserSafe Instalacja 0xc00000bb should Different when meet 0x80073b01 Download 0xc00000d0 0x00007b Convert 0xffff 0xfa54 Activating 0xc000022 TheBestPCFixerWays lxczutildll 0x8007056c Safe 0x778294bc 0x800a0046 Learn Home 0xBCE 0x16427 0x800b0101 0x7c911389 TheBestPCFixerSafe jscript 0x800a138f shouldnt 0x80040DA4-0x80040DA5-WindowsSearchErrorsh">0x80040DA2 0x80040DA4">0x80040DA3-0x80040DA2-0x80040DA4-path">0x80040DA1 0x80040DA4">0x80040DA3 0x80040DA5 0x80040DA4 0x80040DA0 0x80040D9C-firmware-dump-0x80040D9E-GTHRENOTIFACCESSTOKENUPDATED">0x80040D9B ErrorCode 0x80040D9C 0x80040D9E 0x80040D9D 0x80040DB4 0x80040DB2 0x80040DB6 0x80040DBA 0x80040DB7 0x80040DB0 0x80040DAA 0x80040DA9 0x80040DAB 0x80040DAF 0x80040DAE WindowsSearchErrorsh sovle effective 0xc00005 HandypcdoctorWays Hatasi 0xbc3 0x0000007e ignore 0x0000005 uninstalling 0x00 Proven Msvcr100 delete win32 0xxxxxxxxx w1218cl RPCSGROUPMEMBERNOTFOUND solve Techniques VPCF132FX SONY EventTracker malware 3079 Search Source enhancements feature security from shield SharePointPortalServer failure network cache exceeded size Catalog CatalogName Notifications either failed include Resolve manufacturer some Ordered Repair numerical information code deciphered data Category programs many updated often Updates what Precisely updats keep used condition malfunctioned TheBestPCFixerThe 0xffffec75 system application Function 0x80040707 0xce9 Solved 0x80240009 unhandled occurred which including 0x0000898c details 0x004e8e03 exception qtcored4 TEW223PI TrendNet cause Reference crawl Links 0x00009f More change persists content adaptive type 0xc00d11d1 2012 Server isuess 0x80240030 along Panel Control solution 0x800f0922 ofremoving