Why did I get error 0x80040355?

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 0x80040355?

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 0x80040304 database Dynamics const file public history data windows Microsoft occurred backup column 0x80040354 status table Invalid eRoom server accessing delimiter 0x80040356 0x80040353 import 0x80040352 rule 0x8004ff04 conflict 0x80040322 error0x800403040x800400050x80040304 error0x800403550x80040304 backup0x80040304 history0x800402050x80040304 100x80040305 mapi0x800403060x80040304 100x80040005 Search Items 0x80040359 Tips repair 0x8004f034 required format Mismatched source reason record could specified domain name exists only found user 23042010 keyword TABLEINVALIDKEYWORD HRESULT0x80040356 configuration 0x8004034 ArcEngine HRESULT0x80040355 duplicate TABLEDUPLICATECOLUMN HRESULT0x80040358 create multiversioned TABLENOTVERSIONED HRESULT0x80040357 code0x800403050x80040304 Codes EROOMEGROUPDESCTOOLONG group Appendix last minutes ideas characters EROOMEINVALIDDATABASE EROOMEFAILTOSTARTSYBASEDB than cannot description greater times Site Connection Dell SQLAnywhere Community Network DECN Process mmcexe following subsystem encountered initializing storage Most useful method DuplicateLookupFound LookupNotFound uncheckedint0x80040353 2147220653 With Tages0x80040205 code0x80070057 Help rooting 0x80040305 Lisa 2147220652 Quick start Code ErrorCodescs 0x80040357 EROOMEMAXSERVERSEXCEEDED 0x80040358 2147220651 CRMUserDoesNotExist uncheckedint0x80040354 uncheckedint0x80040355 MSDN 24112017 InvalidFormatForDataDelimiter