help me reinstalling Windows Defender

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Hi all, can anyone help me with this?
Any help is very much appreciated.

Thank you in advance.
 
The only thing I can suggest, and I truly would not recommend this, is looking at that list of registry edits, then go to another machine that has functioning Windows Defender, and seeing what value each of those registry keys has and modifying them on your machine accordingly. If that doesn't bring it back then the only sensible thing to do is a completely clean reinstall.

There's just too much garbage in that article for me to trust anything about a system that's been tinkered with using its instructions. Bad premises and bad results.

The article itself, near the very begining, states:

Important: This procedure cannot be reverted without reinstalling Windows.


And since there are procedures, not some small single thing, if all are followed you have an inherently untrustworthy system, in my opinion. Getting a stable baseline back, even though it involves the proverbial "ripping off the band-aid," is the best course of action and that means a completely clean reinstall and reconfiguration of your computer to suit your needs afterward WITHOUT making changes that are not supported by Windows Settings as they stand.
 
The only thing I can suggest, and I truly would not recommend this, is looking at that list of registry edits, then go to another machine that has functioning Windows Defender, and seeing what value each of those registry keys has and modifying them on your machine accordingly. If that doesn't bring it back then the only sensible thing to do is a completely clean reinstall.

There's just too much garbage in that article for me to trust anything about a system that's been tinkered with using its instructions. Bad premises and bad results.
Thank you very much for your suggestions. I'll take a look at the registry.
 
Go to those registry keys and set 0 where there is a 1 and vice versa.
On instead of off.
Then you should add the deleted keys, comparing them with at least two other machines (with the same os).

I don't know the install_wim_tweak command (I'm not in front of my PC), but we could investigate It.
 
If you did everything (or even most of what) that this article recommended for everything it recommended it for, I implore you to just use these instructions for:

Doing a Completely Clean (Re)install of Windows 10 Using Media Creation Tool to Fetch the Win10 ISO File

Doing a Completely Clean (Re)install of Windows 10 Using Media Creation Tool to Create Bootable Win10 Install Media on a USB Thumb Drive

There is no other way to describe what that author proposes than grossly negligent and based on entirely false premises.
 
I sure do not understand why anyone would need to, or even want to uninstall Windows Defender. I can certainly understand wanting to disable it, "IF" a reliable alternative anti-malware solutions is installed - but even then, WD will gracefully disable itself and step out of the way.

Hindsight is (or sure should be) 20/20. But for future reference, the folks at Microsoft are not stupid. And their goal really is for Windows users to experience optimal performance - safely and securely! So it really is best to leave Windows alone and stick with the defaults. Why? Because they work!

If alternative solutions are desired, use the integrated methods Microsoft has built into Windows that allow the use of such alternatives. There is no "need" to "uninstall" the integrated features.

I agree with the others and recommend a clean install of Windows. This is because that procedure involved many extensive changes to the Registry - not to mention the "Important" warning presented at the very beginning. I just don't see how every step can be reversed and I think functional problems will persist - forever - until a clean install is done. :(

If uninstalling these features is done to free up disk space, the better solution is to buy more disk space. These integrated features really don't consume much. If free disk space is that tight, then again the better solution is to buy more disk space.

If this is done because of the belief Microsoft is invading our privacy and thus our security, that is a total fallacy perpetrated by tin-foil hat wearing Microsoft haters. Seriously!

Even at its worse, Microsoft is NOT trying to steal our passwords, full name, birth date, street address, bank account and credit card information, Social Security or Insurance Numbers, personal contacts, or read our emails. Nor is it trying to overwrite security certifications, redirect us to malicious sites, or take control of our computers to send spam or distribute malware, or participate in DDoS attacks against others.

So many just don't understand the difference between security and privacy. The difference is HUGE! These same people have no problems compromising their privacy with their cell phones. For example, on our PCs, Microsoft does not know our real name or our street address. They don't know our physical location. In fact, with an Ethernet connected computer the closest Microsoft knows where we are physically located is our ISP's POP (point of presence). The POP is the physical locations where our ISP connects our computer to the Internet backbone. In my case, that is 10 miles away in the next town over.

On the other hand, our ISP already knows our home address, our real and full name, birth date, and our billing information too. They also know every single website we visit and what we did while there.

Our cell phone carriers are even worse. They also know our home address, our real and full name, birth date, and our billing information. They know who we have talked to and texted. But worse, our cell phone carrier knows exactly where we are standing to within a couple meters. They know the store we are in, the aisle and even the products in the aisle we are standing in front of! They know where we've been, how long we were there, the direction we are heading now and how fast we are moving!

Then of course, there's Google and Facebook - companies who work on the premise of learning everything about us and using (and sharing and selling) that information for their profits!

Frankly, when it comes to privacy concerns, Microsoft is the least of our worries.
 
Thank you all for your answers!
I was able to restore missing Windows Defender files & folders from other computer.
Now, when I try to start WinDefend service, it gives me error 1053: The Service did not Respond to the Start or Control Request.
I think of FRST for you guys to help me fix my issue. What do you think?
 
I think you should listen to the advice being universally offered to you by not only myself, but all subject matter experts, and do a completely clean reinstall of Windows 10.

This will be my last post on this topic, as you have a system that is a "house of cards" and the only real solution is a nuke and pave so you have a known stable foundation. Anything else is pure foolishness.
 
I think you are going down a rabbit hole I have no desire to follow you in to. I told you want I think. Others have too. But you are determined to go your own way. All I can say is, "good luck and I too am stepping out."
 

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