When running Windows Update on my Windows 10 machine, I am constantly prompted by, 'Definition Update for Windows Defender - KB2267602 (Definition 1.213.7334.0) - Error 0x80070643'. When I try to install the update, I'll get the same error message as mentioned above.
(Copied from another thread) I had a very similar situation on Win7 x64 when WD was doing its pre-scan autoupdate. Not really sure why it stopped working for the last 3 weeks or so but suspect something at MS end got changed either deliberately or by accident. If deliberate, it probably shouldn’t be working now should it? I just invoked another defender update from within defender and it displays that it’s up to date with version “1.271.442.0”. But, the MS manual update site displays the current version is “1.271.501.0” dated 7/4/2018 10:07 PM UTC. The MS defender release notes page has version “1.271.504.0” dated 7/4/2018 11:28 PM UTC as the most current version.
So far for today, 7/4/2018, there have been 16 version releases with 1st being “1.271.442.0” & last “1.271.504.0”. As noted in my previous post But the interesting thing is that the update version that Windows Update & Defender found was the 1st one listed for 7/4/2018 – version “1.271.442.0” if you go by the release notes day & time so maybe this is normal. I’m thinking maybe Windows Defender update finds & downloads only the 1st version of the day. If this isn’t the case, maybe it’s BROKEN again?
If you don’t use it or any other malware protection? I’ll try it again in a few hours to see if it still works. – good to know it’s back up for VISTA ?. There might still be a problem for Vista SP2 users. I started Windows Defender (it’s normally disabled on my Vista SP2 machine and I only check for definition updates every month or so) and ran a manual Windows Update this evening. Windows Update did find one available update for Windows Defender, but the installation failed with an error 8070666.
I also noticed that, unlike previous Windows Defender updates, the name of this failed update was Definition Update for Windows Defender Antivirus – KB915597 (Definition 1.271.422.0) so I don’t know if Microsoft has changed the name of the update (i.e., by adding the word “Antivirus”) or if they tried to deliver the full Win 8.x / Win 10 set of antivirus definitions to Vista machines by mistake, which in turn caused the failure. My Windows Defender is currently on definition set 1.269.1075.0 / scan engine 1.1.14901.4. I’ve posted images of my Windows Update failure in post # 16 of devilus’ thread in the bleepingcomputer Vista board. ———— 32-bit Vista Home Premium SP2. Firefox ESR v52.9.0. Norton Security v22.14.2.13 Edited for HTML. Please use text tab for copy/paste.
Hey Guys, I still think there’s something terribly wrong with Windows Defender running on Windows 7 and maybe Vista & XP too. Yesterday, it seemed to work but only found & updated up to version “1.271.442.0” dated 7/4/2018 12:18 AM UTC which was the very 1st version released for 7/4/2018. I just did another Win7 defender update using the pull-down within defender and it said it was “up-to-date” shown below: However, there were a total of 15 version updates after “1.271.442.0” released yesterday 7/4/2018 and another 16 total versions released today 7/5/2018 starting with “1.271.511.0” dated 7/5/2018 12:39 AM UTC and so far ending with “1.271.572.0” dated 7/5/2018 11:19 PM UTC. So, after finding the 1st one released yesterday, defender hasn’t been able to find any of the more current versions released since then even though up to now 31 more current versions have been released. Now I realize that some or all of these 31 updates may only be incremental updates and maybe defender only finds an update when a new complete update file that incorporates the incremental updates is released.
If this is the case (maybe it always was), Windows 7 Windows Defender really is a piece of s.t. Reviewing MS’s last 20 version release notes, there have been dozens upon dozens of added detection’s added to these 31 update releases.
I wouldn’t expect MS to be virtually constantly updating in real time everyone’s definitions as detection’s are discovered. But I would expect that if you manually invoke a defender update, it would find/download/install the MOST current definitions available whether it/they be incremental or not. I use Symantec Endpoint Protection (SEP) version 12.1.6 MP10 and when I update, it updates. (you can also set it to update automatically at 1hr increments from every 1 to 4hrs) I don’t know how MSE or other vendor products update their definitions but I’m now of the opinion that, unless you grab & run the appropriate current definition update file from MS’s Anti-Malware Definition Update website, you really don’t have a clue as to whether you’re scanning with “up-to-date” definitions even though defender (maybe MSE) shows that you’re “up-to-date”. Maybe this is why it’s got the reputation of being a piece of c.p because it doesn’t find anything. Also, I don’t have a clue if any of this applies to other Windows versions but it may.
Any other testers out there? I just tried checked for WD updates via both WU and the WD GUI, on a Vista and a 7 system. Both of them report there are no new updates to download, and both have definition version 1.271.442.0 from July 3 at 6:12 PM. One observation: even when Defender updates were working properly, new definitions would become available only every 3-4 days. So the fact that they can’t find anything more recent than July 3 yet, would appear to be normal (as such things go). But if it gets to be July 8 or 9 and there’s still nothing to be found, then we might have a problem.
These days, more and more people are starting to consider Windows Defender as a reliable security tool. However, it is undeniable that this program is still far from perfect. It is worth noting that errors from the previous and current releases of Windows 10 continue to affect many users. One of the common problems they’ve reported is an error accompanied by a message saying, ‘Protection definition update failed.’ In this article, we will teach you how to fix Protection Definition Update Failed error code. There are various ways to approach this issue. So, it is best to try our methods below to find which one will work for you.
Method 1: Deleting temporary files It is quite common to learn that certain system files associated with update storage and distribution have been corrupted. In this case, it is possible that the previous version of Windows Defender virus definition has been affected. To get rid of this problem, it is advisable to remove all temporary files and restart the update procedure. It is worth noting that Windows Defender automatically and regularly updates its definition, storing the files in a dedicated folder.
It would also help if you delete the contents of this folder. Here are the steps in removing the contents of the Definition folder and the temporary system files:. Click the Search icon on the taskbar. Type “Disk” (no quotes). Choose Disk Cleanup from the results.
Select the System Partition (C:), then click OK. Choose Clean up System Files. Make sure that the box beside ‘Temporary files’ is checked.
Click OK to clean up the temporary files. The next thing to do is boot into Safe Mode. Navigate to this path: C: Windows Software Distribution. Delete the folder’s content.
Restart your computer and check if your Windows Defender’s behavior has improved. Restart your computer. Make sure that your PC is connected to the Internet. From this point on, Windows Defender will automatically get the update and install it. Method 2: Using an elevated Command Prompt to update Windows Defender There is also a workaround for this issue, and that is to update Windows Defender via an elevated Command Prompt.
That said, here are the steps you should follow:. Right-click the Windows icon on the taskbar. Select Command Prompt (Admin).
This should open the elevated Command Prompt. Once the Command Prompt is up, paste the following, one by one:. cd /d “ Program Files Windows Defender”.
exe –signatureupdate The steps above should initiate a fresh Windows Defender update. Once the process is done, check if the error still persists. Method 3: Restarting Windows Defender service If you notice that Defender itself is misbehaving or stalling, then there are certain steps you should follow. It is true that Windows Defender is a built-in component of the Windows 10 shell. However, it can still be disabled when there is a third-party antivirus installed in the computer.
As such, we advise you to check the dedicated service for Windows Defender and ensure that it is set to start automatically. Simply follow these steps:. On your keyboard, press Windows Key+R. This should open the Run dialog. Type “services.msc” (no quotes), then hit Enter. Browse through the individual services associated with Windows Defender.
Right-click every service, then open Properties. Make sure that all of them are set to automatically start. Method 4: Manually updating Windows Defender Like any other program, you can manually download the latest definition for Windows 10 and install it on your computer. Needless to say, you can also opt to manually update Windows Defender. Just follow the instructions below:. Go to Microsoft’s website and look for the latest update.
Install the updates, then restart your computer. Open Windows Defender and check if the error has been fixed.
![Definition Update For Windows Defender Kb915597 Definition 1.55 1119.0 Definition Update For Windows Defender Kb915597 Definition 1.55 1119.0](http://www.filebuzz.com/software_screenshot/full/75989-Advanced_Audio_Recorder.jpg)
Those are some of the methods you can try to fix Protection Definition Update Failed error code. We hope we’ve helped you in some way.
On the other hand, if you do not want to completely rely on Windows Defender for security, we suggest using a reliable tool like. This program detects malicious items and keeps your computer safe and secure.
What’s more, it is designed not to conflict with your main anti-virus. It can even catch items that Windows Defender may miss! Do you have questions about the solutions we provided? Don’t hesitate to ask them through the comments below!