How to remove “Windows Defence Unit” virus (Removal Guide)

Windows Defence Unit is a computer virus, which masquerades as genuine security software, while actually reporting non-existent malware threats in order to scare the user into paying $99,90 for this rogue security software.

What is Windows Defence Unit?

Windows Defence Unit is a rogue anti-virus program from the Rogue.FakeVimes family of computer infections. This program is classified as a rogue because it pretends to be an anti-virus program, but will instead displays bogus scan results, report non-existing computer infections, and does not allow you to run your normal applications.
In this case, not only is Windows Defence Unit going to disrupt your system, it’s going to try and trick you into making a purchase using your credit card.
Windows Defence Unit appears in the form of a fake Windows warning on your computer system that reads you have a specific number of viruses on your computer (usually in the hundreds) and that this software has detected those viruses. To get rid of them you must purchase the full-version of Windows Defence Unit. It’s important to remember that by purchasing the “claimed full version to remove the viruses” you will be submitting your personal information to unscrupulous persons and may also end up being a victim of credit card or identity fraud or theft.

To protect itself from being removed, Windows Defence Unit will also terminate any application you try to run on your computer. It does this to protect itself from being removed by legitimate security programs and to scare you into thinking your programs are infected. When this infection terminates a program it will display a message similar to the following:

Firewall has blocked a program from accessing the Internet
c:\windows\system32\taskmanger.exe
is suspected to have infected your PC.
This type of virus intercepts entered data and transmits them
to a remote server.

How did Windows Defence Unit virus got on my computer?

Windows Defence Unit is distributed through several means. Malicious websites, or legitimate websites that have been hacked, can infect your machine through exploit kits that use vulnerabilities on your computer to install this rogue antivirus without your permission.
Another method used to propagate Windows Defence Unit is spam email containing infected attachments or links to malicious websites. Cyber-criminals spam out an email, with forged header information, tricking you into believing that it is from a shipping company like DHL or FedEx. The email tells you that they tried to deliver a package to you, but failed for some reason. Sometimes the emails claim to be notifications of a shipment you have made. Either way, you can’t resist being curious as to what the email is referring to – and open the attached file (or click on a link embedded inside the email). And with that, your computer is infected with the Windows Defence Unit virus.
The threat may also be downloaded manually by tricking the user into thinking they are installing a useful piece of software, for instance a bogus update for Adobe Flash Player or another piece of software.
The Windows Defence Unit infection is also prevalent on peer-to-peer file sharing websites and is often packaged with pirated or illegally acquired software.

Am I infected with Windows Defence Unit virus?

Some examples of the interface, fake alerts, fake scanning results, and pop-ups displayed by Windows Defence Unit virus are shown below:

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How to remove Windows Defence Unit virus (Removal Guide)

This page is a comprehensive guide, which will remove the Windows Defence Unit infection from your your computer. Please perform all the steps in the correct order. If you have any questions or doubt at any point, STOP and ask for our assistance. Please keep in mind that to perform this removal guide, you will need a clean (non-infected) computer and a CD or USB stick.

OPTION 1: Remove Windows Defence Unit virus using its activation code
OPTION 2: Remove Windows Defence Unit virus by fixing your Windows Registry
OPTION 3:Remove Windows Defence Unit virus with System Restore

OPTION 1: Remove Windows Defence Unit virus using its activation code

STEP 1: Use the Windows Defence Unit activation key to stop its malicious behavior

Windows Defence Unit has hijacked your Windows Registry to launch itself before any application and stop you from running any other program. To prevent this from happening, we can use the below code to register Windows Defence Unit.

1. Open Windows Defence Unit interface, click on the question mark button in the right top corner, then click on Register button.
   
2. When the Windows Defence Unit Registration box will pop-up, enter the below registration codes to activate this rogue antivirus.
   Windows Defence Unit Product Key: 0W000-000B0-00T00-E0021
   
3. Windows Defence Unit should now allow Windows to start, and you should be able to open your browser and any other programs.
   Please keep in mind that entering the above registration code will NOT remove Windows Defence Unit from your computer, instead it will just stop the fake alerts so that you’ll be able to complete this removal guide without being interrupted by this infection.

STEP 2: Remove Windows Defence Unit virus with Malwarebytes Anti-Malware FREE

Malwarebytes Anti-Malware Free is a powerful on-demand scanner which will remove Windows Defence Unit malicious files from your computer.

1. You can download Malwarebytes Anti-Malware Free from the below link, then double-click on the icon named mbam-setup.exe to install this program.
   MALWAREBYTES ANTI-MALWARE DOWNLOAD LINK(This link will open  a new  web page from where you can download Malwarebytes Anti-Malware Free)
2. When the installation begins, keep following the prompts in order to continue with the setup process, then at the last screen click on the Finish button.
   
3. On the Scanner tab, select Perform quick scan, and then click on the Scan button to start searching for the Windows Defence Unit malicious files.
   
4. Malwarebytes’ Anti-Malware will now start scanning your computer for Windows Defence Unit virus as shown below.
   
5. When the Malwarebytes Anti-Malware scan has finished, click on the Show Results button.
   
6. You will now be presented with a screen showing you the computer infections that Malwarebytes Anti-Malware has detected. Make sure that everything is Checked (ticked), then click on the Remove Selected button.
   
7. Once your computer will restart in Windows regular mode, open Malwarebytes Anti-Malware and perform a Full System scan to verify that there are no remaining threats.

STEP 3: Remove Windows Defence Unit infection with HitmanPro

HitmanPro is a second opinion scanner, designed to rescue your computer from malware (viruses, trojans, rootkits, etc.) that have infected your computer despite all the security measures you have taken (such as anti virus software, firewalls, etc.). HitmanPro is designed to work alongside existing security programs without any conflicts. It scans the computer quickly (less than 5 minutes) and does not slow down the computer.

1. You can download HitmanPro from the below link:
   HITMANPRO DOWNLOAD LINK (This link will open a web page from where you can download HitmanPro)
2. Double-click on the file named HitmanPro.exe (for 32-bit versions of Windows) or HitmanPro_x64.exe (for 64-bit versions of Windows). When the program starts you will be presented with the start screen as shown below.
   
   Click on the Next button, to install HitmanPro on your computer.
   
3. HitmanPro will now begin to scan your computer for Windows Defence Unit trojan.
   
4. When it has finished it will display a list of all the malware that the program found as shown in the image below. Click on the Next button, to remove Windows Defence Unit virus.
   
5. Click on the Activate free license button to begin the free 30 days trial, and remove all the malicious files from your computer.
   

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OPTION 2: Remove Windows Defence Unit virus by fixing your Windows Registry

In some cases the above registration may not work, so we will need to fix your Windows Registry so that we can boot the computer without being blocked by the Windows Defence Unit infection.

STEP 1 : Start your computer in Safe Mode with Command Prompt

1. Remove all floppy disks, CDs, and DVDs from your computer, and then restart your computer.
2. When the computer starts you will see your computer’s hardware being listed. When you see this information start to gently tap the F8 key repeatedly until you are presented with the Windows XP, Vista or 7 Advanced Boot Options.
   
   If you are using Windows 8, press the Windows key + C, and then click Settings. Click Power, hold down Shift on your keyboard and click Restart, then click on Troubleshoot and select Advanced options. In the Advanced Options screen, select Startup Settings, then click on Restart. Alternatively, you can read this guide to start Windows 8 in Safe Mode.
3. If you are using Windows XP, Vista or 7 in the Advanced Boot Options screen, use the arrow keys to highlight Safe Mode with Command Prompt , and then press ENTER.
   
   If you are using Windows 8, press 6 on your keyboard to Enable Safe Mode with Command Prompt.
   Windows will start in Safe Mode with Networking.

STEP 2: Fix your Windows Registry to remove Windows Defence Unit and scan with Malwarebytes Anti-Malware and HitmanPro

Windows Defence Unit has hijacked your Windows Registry to start automatically before your Windows desktop is shown, which makes your computer unusable until the infection is removed.

1. While your computer is in Safe Mode with Command Prompt, the Command Prompt allows you to type commands and then press Enter on your keyboard to execute them.
   In this Command Prompt window, please type explorer.exe and then press Enter on your keyboard.
   
2. The Windows desktop will now appear. When the desktop appears you can then close the Command Prompt window by clicking on the X.
3. Using a clean (non-infected) computer download onto a CD or USB stick the below program to fix your Windows Registry:
   REGFIX DOWNLOAD LINK (This link will automatically download the registry fix for the Windows Defence Unit infection)
4. Now insert your CD or USB drive into the infected machine and open up the drive letter associated with your inserted media. You can access this drive letter by opening the Computer icon on your desktop or from the Start Menu. Once the drive letter is open, double-click on the RegFix.reg and allow the data to be merged when you are prompted. Once the data has been merged, you can press the OK button and remove the removable media from your computer.
   
5. Please reboot your computer into the normal Windows mode and login as the infected user. When you are back at your normal Windows desktop perform a scan with Malwarebytes Anti-Malware and HitmanPro as seen in OPTION 1.

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OPTION 3: Remove Windows Defence Unit virus with System Restore

System Restore helps you restore your computer’s system files to an earlier point in time. It’s a way to undo system changes to your computer without affecting your personal files, such as e‑mail, documents, or photos.

1. Reboot your computer into Safe Mode with Command Prompt. To do this, turn your computer off and then back on and immediately when you see anything on the screen, start tapping the F8 key on your keyboard.
   
   If you are using Windows 8, the trick is to hold the Shift button and gently tap the F8 key repeatedly, this will sometimes boot you into the new advanced “recovery mode”, where you can choose to see advanced repair options. On the next screen, you will need to click on the Troubleshoot option, then select Advanced Options and select Windows Start-up Settings. Click on the Restart button, and you should now be able to see the Advanced Boot Options screen.
2. Using the arrow keys on your keyboard, select Safe Mode with Command Prompt and press Enter on your keyboard.
   
3. At the command prompt, type rstrui.exe, and then press ENTER.
   
   Alternatively, if you are using Windows Vista, 7 and 8, you can type: C:\windows\system32\rstrui.exe , and press Enter. And if you are a Windows XP user, type C:\windows\system32\restore\rstrui.exe, then press Enter.
4. System Restore should start, and you will display also a list of restore points. Try using a restore point created just before the date and time the Windows Defence Unit virus has infected your computer.
   
5. When System Restore has completed its task, start your computer in Windows regular mode, and perform a scan with Malwarebytes Anti-Malware and HitmanPro.

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Your computer should now be free of the Windows Defence Unit infection. If your current anti-virus solution let this infection through, you may want to consider purchasing the PRO version of Malwarebytes Anti-Malware to protect against these types of threats in the future, and perform regular computer scans with HitmanPro.
If you are still experiencing problems while trying to remove Windows Defence Unit from your machine, please start a new thread in our Malware Removal Assistance forum.