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windows update error c80003fa

windows update error c80003fa

windows update error c80003fa


Windows update is not working on my PC. I run w7 64 on an Acer machine. I get the same message over and over . error code is C80003fa. I've search the web for solutions but everything failed. I've tryed renaming SoftwareDistribution, The miscrosoft fix, The Stand alone installer. All drivers/BIOS are up to date. There is no virus or malwarare on the machine , its a fresh installation. Can someone help me it's getting very frustrating.

Thanks in advance for your help.


RE: windows update error c80003fa

Make sure date and time both in Windows and in BIOS are correct.



RE: windows update error c80003fa

Hi Jim,
BIOS and Windows clocks are at the same time.


RE: windows update error c80003fa

Hi Dan,

Have you tried this Microsoft fix?

Let me know if it helps you.


RE: windows update error c80003fa

Have you tested with another Windows user?

How to troubleshoot a problem by performing a clean boot in Windows Vista or in Windows 7

How do I reset Windows Update components?

Have you tried this.

Description of the System Update Readiness Tool for Windows Vista, for Windows Server 2008, for Windows 7, and for Windows Server 2008 R2

RE: windows update error c80003fa

Hi Linney,
I have tried all the above suggestion, no luck. still have the same problem. Windows update keep showing the error code.
Thks for your help.

RE: windows update error c80003fa

Running some searches for that error code at the MS Knowledge base  points to connection problems as being the cause.

Try clearing your DNS cache (ipconfig /flushdns) in a command prompt.

Power cycling your router (if you can) and wait around a minute before powering it back up.

Depending on your ISP you could try setting your network connection to use Google's public DNS servers ( and  


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Time flies like an arrow, however, fruit flies like a banana.
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RE: windows update error c80003fa

What happens if you manually download updates?  Can you download them bearing in mind ChrisHirst's last post?

Use any known KB number to search for relevant updates here.

RE: windows update error c80003fa

Thanks everyone for your help. Any of the Microsoft FIX was able to correct the problem.I'm not able to download the updates manually. I'm able to go on the internet without a problem. My router is not the problem, i have a DELL PC running W7,plugged on the same router and the updates are working fine. Virus ans malwares are not the problems, it's a fresh/clean installation. There is no antivirus installed and no firewall. It's seems to be a dead end, could it be related to any hardware problem instead of the software. Any suggestions are more than welcome.



RE: windows update error c80003fa

Just another idea. Could it be related to any registry issues ??

RE: windows update error c80003fa

Hi BadBigBen

I have tried to install SP1 manually ,and it failed, Here is the error code:
"Catastrophic failure" Error E_UNEXPECTED (0X8000ffff )
What else can i do ??

Tks for the suggestion.


RE: windows update error c80003fa

With mention of the word "Catastrophic" it might pay you to start looking at hardware problems as a cause.

Try running ChkDsk to check your drive for errors. Right-click your Drive icon/ Properties/ Tools/ Error Checking.  Try it first by not checking either box (this will run it in a Read-only mode) to see if it flags any hard drive or file problems.  If it does, restart  it by ticking both boxes, and rerun it to allow it to attempt to fix any found problems.

The hard drive manufacturer will have free diagnostic software that is bootable, or that  may even run from within Windows, that will thoroughly check the condition of your hard drive

How to Use the Memory Diagnostics Tool in Vista or Windows 7.


RE: windows update error c80003fa

HI Linney,

ChkDsk found no errors on the hard drive.
Thanks for your help. I will continue to seach what may cause the problem.

Thank you for your input  dazed

RE: windows update error c80003fa

1. if you have any AV software running, then at this stage disable it...
2. through the search bar type COMMAND, at the top choose the COMMAND applet and right click then "run as Administrator", then enter the following in the CMD window: SFC /SCANNOW
this will check the integrity of the system files, have the install DVD at hand in case it is asked for...
3. run CHKDSK /F thereafter...
4. reboot
5. check that ALL drivers for all devices are up to date, including the chipset drivers and VGA drivers...
6. attempt to run the SP1 installer again, if you have another PC try downloading the SP1 there and then transfer it to your PC/Laptop (e.g. USB thumb drive / USB HDD)...

"If it works don't fix it! If it doesn't use a sledgehammer..."
How to ask a question, when posting them to a professional forum.
Only ask questions with yes/no answers if you want "yes" or "no"

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