Kada pregledavam forume, često mi se ovo pitanje postavlja mnogo puta – ne mogu ručno uključiti Windows Defender ili se Windows Defender neće ili neće uključiti i pokrenuti u sustavu Windows 11^{(Windows 11)} , Windows 10, Windows 8 ili Windows 7. Ako se suočite s ovim problemom, onda bi vam ovaj post mogao pomoći.

Ne može se uključiti Windows Defender u Windows 11/10

Ako ne možete pokrenuti Windows Defender , jedan od ovih prijedloga će vam sigurno pomoći:

1. Provjerite imate li instaliran drugi sigurnosni softver
2. Provjerite datum ili vrijeme na računalu
3. Pokrenite Windows Update
4. Provjerite postavke internetske zone
5. Provjerite postavku pravila grupe
6. Provjerite postavke registra
7. Provjerite status usluge
8. Skenirajte računalo s prijenosnim antivirusnim softverom
9. Provjerite vrijednost AllowUserUIaccess .

Pogledajmo prijedloge detaljno.

1] Provjerite^(Check) imate li instaliran drugi sigurnosni softver

Jedno od najčešćih ponašanja Windows Defendera^{(Windows Defender)} je da ako otkrije antivirusni softver treće strane, Windows Defender će se sam isključiti. Windows je dizajniran za otkrivanje prisutnosti instaliranog sigurnosnog softvera i često vidimo obavijest u Akcijskom centru^{(Action Center)} . Jedan od uobičajenih problema koje smo vidjeli u prošlosti je kada je instalirano više sigurnosnih softvera. To često stvara sukob među njima i na kraju stvara više problema nego što čini dobro. Često zamrzavanje, rušenje aplikacija neki su od uobičajenih problema koji se javljaju kada instalirate više od jednog antivirusnog softvera.

Da bi se izbjegla ova situacija, Windows Defender će se sam isključiti kada otkrije drugi sigurnosni program. Isto tako^(Likewise) , ako ova sigurnosna aplikacija ima vatrozid^(Firewall) , tada će i Windows vatrozid^{(Windows Firewall)} prestati raditi. Dakle, u slučaju da želite da  Windows Defender radi, morat ćete deinstalirati sigurnosni softver treće strane i ponovno pokrenuti sustav.

Često^(Often) korisnici možda nisu svjesni je li sigurnosni softver doista instaliran ili ne jer kada kupite novo prijenosno računalo, uglavnom dolazi s probnom verzijom sigurnosnog softvera kao što su Norton , McAfee itd. Zatim kada instalirate aplikacije poput Flasha^(Flash) ili Java , moglo bi zatražiti od vas da deinstalirate besplatni sigurnosni skener kada većina njih to ne primijeti. Stoga je najbolje pretražiti svoje računalo ako niste sigurni je li sigurnosni softver instaliran ili ne. Nakon što ga uklonite, možda ćete ga morati ručno ponovo uključiti.

Upišite " Windows Defender " u okvir za pretraživanje, a zatim pritisnite Enter . Kliknite ^(Click) Postavke^(Settings) i provjerite postoji li kvačica na Uključi zaštitu u stvarnom vremenu preporučuje^{(Turn on real-time protection recommend)} .

U sustavu Windows 10^{(Windows 10)} otvorite Windows Security > Virus i prebacite prekidač Zaštita u stvarnom vremenu^{(Real-Time Protection)} na položaj Uključeno.

2] Provjerite^(Check) datum ili vrijeme na računalu

Drugi problem koji može uzrokovati da Windows Defender ne radi ispravno je netočan datum ili vrijeme na vašem Windows računalu. Provjerite jeste li ispravno postavili sat i datum u sustavu Windows, a zatim pokušajte ponovno uključiti Windows Defender i provjerite radi li dobro. Čudno je, ali većina funkcija operacijskog sustava Windows radi, na temelju datuma i vremena sustava. Dakle, netočan datum ili vrijeme može izazvati nenormalno ponašanje u vašem Windows OS -u .

3] Pokrenite Windows Update

Još jedna važna stvar koja bi mogla uzrokovati probleme je, ako vaš Windows nije ažuriran, u smislu Windows Update . To bi moglo uzrokovati probleme u Windows Defenderu^{(Windows Defender)} ili bilo kojoj drugoj osnovnoj aplikaciji sustava Windows . ^(Windows)Kada je riječ o bilo kojem sigurnosnom softveru, uvijek mu trebaju najnovija ažuriranja potpisa i druga ažuriranja jezgre sustava Windows^(Windows) kako bi vaše računalo bilo sigurno. Stoga bih toplo preporučio pokretanje kompletnog Windows Updatea^{(Windows Update)} , a zatim idite u Windows Defender i od tamo također pokrenite ažuriranje. Zatim provjerite radi li vaš Windows Defender dobro.

4] Provjerite postavke internetske zone

Gore navedeni scenariji su najčešći. Osim ovih, moglo bi doći do nekih manjih problema koji bi mogli utjecati na rad Windows Defendera^{(Windows Defender)} . To bi mogla biti netočna postavka zone u ^(Zone)Internet Exploreru^{(Internet Explorer)} , što možete popraviti vraćanjem Internet Explorera^{(Internet Explorer)} na tvorničke postavke. Opet^(Again) , ako koristite proxy poslužitelj, Windows Defender se neće moći ažurirati.

U takvim slučajevima morate napraviti male promjene na svom proxy poslužitelju.

Pritisnite Windows + X i odaberite Naredbeni redak (Administrator)^{(Command Prompt (Admin))}

Upišite sljedeće i pritisnite Enter:

NETSH WINHTTP SET PROXY 1.1.1.1:8080 or NETSH WINHTTP SET PROXY MYPROXY.NET:8080

Sada ponovno pokrenite sustav i provjerite radi li.

5] Provjerite postavku pravila grupe

Otvorite uređivač grupnih pravila i idite na sljedeću postavku:

Computer Configuration > Administrative Template > Windows Components > Windows Defender Antivirus.

S^(SIn) U desnom oknu dvaput kliknite na Isključi Windows ^(Turn)Defender Antivirus^{(Windows Defender Antivirus)} .

Zatim odaberite Nije konfigurirano^(Configured) , kliknite gumb Primijeni^(Apply) i U redu.

6] Provjerite postavke registra

Otvorite uređivač registra i idite na sljedeću postavku:

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender

Pronađite ključ DisableAntiSpyware . Ako ovaj ključ nije prisutan, stvorite novu i DWORD (32-bitnu) vrijednost .

Postavite podatke o vrijednosti na 0 i izađite.

7] Provjerite status usluge

Pokrenite services.msc da otvorite Services Manager^{(open Services Manager)} . Provjerite je li usluga Windows Defender^{(Windows Defender service)} pokrenuta i postavljena na Automatski.

8] Skenirajte računalo s prijenosnim antivirusnim softverom

Konačno, to bi mogao biti i sam zlonamjerni softver koji uzrokuje da Windows Defender ne radi ispravno. Možete preuzeti i koristiti izvanmrežni alat Windows Defender ili bilo koji drugi samostalni antivirusni softver^{(standalone antivirus software)} i pokrenuti potpuno skeniranje.

9] Provjerite vrijednost AllowUserUIAccess

Ako je pod sigurnosnim^{(Windows Security)} postavkama sustava Windows opcija za " Zaštita od virusa i prijetnji^{(Virus & threat protection)} " nestala, Andrew predlaže sljedeće:

Pokrenite uređivač registra^{(Run Registry Editor)} kao administrator i idite na:

Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Policy Manager

Postavite vrijednost AllowUserUIAccess na 1.

Ovo su neki uobičajeni razlozi zašto se Windows Defender ne pokreće.

PS : Windows Defender je isključen ili ne radi^{(Windows Defender is turned off or not working)}  nudi neke dodatne prijedloge za rješavanje problema, koji bi vas također mogli zanimati.

Možda biste željeli pogledati i ove postove koji pomažu u rješavanju problema Windows Defendera:^{(You may also want to check out these posts which help troubleshoot Windows Defender problems:)}

1. Pogreška 0x800106a, Windows Defender se neće uključiti
2. Kod pogreške Windows Defendera 0x800106ba: Aplikacija se nije uspjela inicijalizirati^{(Windows Defender Error Code 0x800106ba: Application failed to initialize)}
3. Pogreška Windows Defendera: MSASCui.exe – Nije moguće locirati komponentu
4. Pogreška 0x80070422 Usluga se nije mogla pokrenuti u Windows Defenderu^{(Error 0x80070422 The Service Couldn’t Be Started in Windows Defender)}
5. Pogreška 0x80508020, 0x800705b4 za Windows Defender .

Can't turn on Windows Defender in Windows 11/10

When I browse through forums I often find this question asked many times – I am unable to turn on Windows Defender mаnually or Windows Defender won’t or wіll not turn on and start in Windows 11, Windows 10, Windows 8, or Windows 7. If уou face this issue, then this post may helр you.

Can’t turn on Windows Defender in Windows 11/10

If you are unable to start Windows Defender, then one of these suggestions is sure to help you:

1. Check if you have another security software installed
2. Check the date or time on your PC
3. Run Windows Update
4. Check Internet Zone settings
5. Check Group Policy setting
6. Check Registry setting
7. Check the status of Service
8. Scan PC with portable antivirus software
9. Check the value of AllowUserUIAccess.

Let us see the suggestions in detail.

1] Check if you have another security software installed

One of the most common behaviors of Windows Defender is that if it detects a third-party antivirus software, then Windows Defender will shut itself off. Windows is designed to detect the presence of security software installed, and we often get to see the notification in the Action Center. One of the common issues we have seen in the past is when there are multiple security software installed. It often creates a conflict between them and in the end, it creates more trouble than doing any good. Frequent freezing, crashing to applications are some of the common issues which occur when you install more than one antivirus software.

So to avoid this situation, Windows Defender will turn itself off when it detects another security program. Likewise, if this security application has a Firewall, then Windows Firewall will also stop working. So in case you want Windows Defender to work, then you will have to uninstall your third-party security software and reboot the system.

Often users may be unaware if security software is indeed installed or not because when you buy a new laptop, mostly it comes with a trial version of security software like Norton, McAfee, etc. Then when you install applications like Flash or Java, it might prompt you to uninstall free security scanner when most of them don’t notice. So it’s best to search your PC if you’re not sure if security software is installed or not. Once it’ removed you may need to turn it manually back on.

Type “Windows Defender” in the search box and then press Enter. Click Settings and make sure there is a checkmark on Turn on real-time protection recommend.

On Windows 10, open Windows Security > Virus protection and toggle the Real-Time Protection switch to On position.

2] Check the date or time on your PC

The other issue that could cause Windows Defender not to work properly is the incorrect date or time on your Windows machine. Make sure you have set your Windows clock & date set properly and then try to turn your Windows Defender back on and see if it works fine. It’s strange, but most of the Windows operating system functions work, based on the system date and time. So an incorrect date or time could trigger abnormal behavior in your Windows OS.

3] Run Windows Update

Another important thing that could cause issues is, if you Windows is not up to date, in terms of Windows Update. This could cause issues in Windows Defender or any other Windows core application. When it comes to any security software, it always needs the latest signature updates and other Windows core updates to keep your PC secure. So I would highly recommend running a complete Windows Update, then go into Windows Defender and run an update from there as well. Then see if your Windows Defender is working fine.

4] Check Internet Zone settings

The above-discussed scenarios are the most common ones. Apart from these, there could be some minor issues that could affect the working of Windows Defender. It could be an incorrect Zone setting in Internet Explorer, which you can fix by resetting Internet Explorer to factory settings. Again, if you are using a Proxy server, Windows Defender will not be able to update.

In such cases, you need to make some small changes to your Proxy server.

Press Windows + X and select Command Prompt (Admin)

Type in the following and hit Enter:

NETSH WINHTTP SET PROXY 1.1.1.1:8080 or NETSH WINHTTP SET PROXY MYPROXY.NET:8080

Now reboot the system and see if it works.

5] Check Group Policy setting

Open Group Policy Editor and navigate to the following setting:

Computer Configuration > Administrative Template > Windows Components > Windows Defender Antivirus.

SIn the right pane, double-click on Turn off Windows Defender Antivirus.

Next, select Not Configured, click the Apply and OK button.

6] Check Registry setting

Open Registry Editor and navigate to the following setting:

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender

Locate DisableAntiSpyware key. If this key is not present, create a new and DWORD (32-bit) Value.

Set its Value data to 0 and exit.

7] Check the status of Service

Run services.msc to open Services Manager. Ensure that the Windows Defender service is started and set to Automatic.

8] Scan PC with portable antivirus software

Finally, it could be a malware itself that’s causing Windows Defender not to work properly. You could download and use Windows Defender Offline Tool or any other standalone antivirus software and run a complete scan.

9] Check value of AllowUserUIAccess

If under Windows Security settings, the option for “Virus & threat protection” has disappeared, then Andrew suggests the following:

Run Registry Editor as Administrator and go to:

Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Policy Manager

Set value of AllowUserUIAccess to 1.

These are some common reasons why Windows Defender does not start.

PS: Windows Defender is turned off or not working offers some additional troubleshooting suggestions, which may also interest you.

You may also want to check out these posts which help troubleshoot Windows Defender problems:

1. Error 0x800106a, Windows Defender will not turn on
2. Windows Defender Error Code 0x800106ba: Application failed to initialize
3. Windows Defender Error: MSASCui.exe – Unable To Locate Component
4. Error 0x80070422 The Service Couldn’t Be Started in Windows Defender
5. Error 0x80508020, 0x800705b4 for Windows Defender.

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