Remove “Important Security Alert from Windows” Virus

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Is your PC screen covered in alerts, security messages and pop-ups? Then it’s safe to say your computer is no longer virus-free. At some point in the recent past, you’ve downloaded a stealthy adware-type virus. This pest is wreaking havoc on your machine as we speak. Furthermore, it is hiding somewhere in the corners of your device and is constantly exposing you to threats. Adware is not as harmless as it appears to be. Yes, this is considered to be the least destructive type of infection you could cross paths with online. That is only if you take action immediately, though. Any kind of parasite gets out of control eventually. Thus, if this pest spends enough time on your PC, things will get very complicated. The sooner you get rid of the adware, the better. Now, how does this nuisance work? Once your computer gets infected, the virus makes modifications. None of those involves your permission in any way, as you could imagine. Adware’s very last concern is to take care of your preferences. Thanks to the parasite’s unauthorized changes, the pop-ups appear. What is important for you to remember is that these “important security alerts” have nothing to do with Microsoft. They are light years away from being legitimate. As mentioned already, the pop-ups are caused by one nasty adware infection. You are actually involved in an attempt for a tech support scam and, if you trust the pop-ups, you may lose money. According to the alerts, “some suspicious activity” has been detected on your device. Keep in mind that your device is perfectly fine, though. You only have a tricky adware-type parasite on your computer. Forget about the never-ending pile of malicious programs and threats the pop-up scare you with. The reason why you’re seeing these alerts is so hackers could steal your money. Supposedly, your computer is full of malware and spyware. And, conveniently enough, the pop-ups offer a toll-free phone number (866-995-5065) for you to call. Make sure you never dial this number. It will certainly not contact you with real Microsoft technical assistants. It will contact you directly with the parasite’s creators. Crooks are simply trying to sell you some useless software and services. Do not let them involve you in this fraud.

Remove "Important Security Alert from Windows"

How did I get infected with?

The number one tactic out there is called freeware bundling. We assume that you often download bundled programs off of the Internet. What many people fail to do is check out the exact programs they install. Hackers could attach all sorts of infections to a seemingly safe bundle. Hence, always keep an eye out for potential “bonuses”. You may accidentally download a whole bunch of parasites if you skip installation steps. Rushing may seem like a good idea at the time but it’s very dangerous in the long run. Instead of skipping steps, opt for the Advanced/Custom option in the Setup Wizard. Make sure you’re aware what programs you agree to install. Remember that infections are very secretive and rely on various tricks. In order to protect your safety, you have to pay close attention to what you install. Check out the Terms and Conditions or EULA (End User License Agreements) too. Don’t underestimate the threat freeware and shareware bundles pose to you. Be cautious instead. Another popular infiltration method involves spam messages or spam email-attachments. Those could turn out to be corrupted so stay away from anything suspicious in your inbox. It is in your best interest to protect your device from parasites. Otherwise, you will have to uninstall a virus which is a much greater hassle.

Why is this dangerous?

The pop-ups and alerts must be ignored. Trusting those fake promises and empty threats can’t end well for you and you know it. Hackers use tech support scams to gain effortless profit online. However, you do not have to become their sponsor by giving away your money. Stay away from the phone number provided and don’t buy any software “recommended” by the pop-ups. You would be trying to delete fictional, non-existent parasites. The virus that has to be removed is the adware-type nuisance. Its bogus alerts aim at luring you into paying for worthless anti-malware programs. To prevent getting scammed, uninstall the adware ASAP. You have nothing to lose by deleting this rogue parasite. On the other hand, you do have quite a lot to gain. Please follow our detailed manual removal guide down below.

How to Remove “Important Security Alert from Windows” virus

The “Important Security Alert from Windows” infection is specifically designed to make money to its creators one way or another. The specialists from various antivirus companies like Bitdefender, Kaspersky, Norton, Avast, ESET, etc. advise that there is no harmless virus.

If you perform exactly the steps below you should be able to remove the “Important Security Alert from Windows” infection. Please, follow the procedures in the exact order. Please, consider to print this guide or have another computer at your disposal. You will NOT need any USB sticks or CDs.

WARNING! Stopping the wrong file or deleting the wrong registry key may damage your system irreversibly.
If you are feeling not technical enough just use Spyhunter Professional Malware Removal Tool to deal with the problem!
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Please, keep in mind that SpyHunter’s scanner tool is free. To remove the “Important Security Alert from Windows” infection, you need to purchase its full version.

STEP 1: Track down “Important Security Alert from Windows” in the computer memory

STEP 2: Locate “Important Security Alert from Windows” startup location

STEP 3: Delete “Important Security Alert from Windows” traces from Chrome, Firefox and Internet Explorer

STEP 4: Undo the damage done by the virus

STEP 1: Track down “Important Security Alert from Windows” in the computer memory

  • Open your Task Manager by pressing CTRL+SHIFT+ESC keys simultaneously
  • Carefully review all processes and stop the suspicious ones.


  • Write down the file location for later reference.

Step 2: Locate “Important Security Alert from Windows” startup location

Reveal Hidden Files

  • Open any folder
  • Click on “Organize” button
  • Choose “Folder and Search Options”
  • Select the “View” tab
  • Select “Show hidden files and folders” option
  • Uncheck “Hide protected operating system files”
  • Click “Apply” and “OK” button

Clean “Important Security Alert from Windows” virus from the windows registry

  • Once the operating system loads press simultaneously the Windows Logo Button and the R key.


  • A dialog box should open. Type “Regedit”


Depending on your OS (x86 or x64) navigate to:

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run] or
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] or

  • and delete the display Name: [RANDOM]

delete backgroundcontainer

  • Then open your explorer and navigate to: %appdata% folder and delete the malicious executable.

Clean your HOSTS file to avoid unwanted browser redirection

Navigate to %windir%/system32/Drivers/etc/host

If you are hacked, there will be foreign IPs addresses connected to you at the bottom. Take a look below:


STEP 3 : Clean “Important Security Alert from Windows” traces from Chrome, Firefox and Internet Explorer

  • Open Google Chrome

  • In the Main Menu, select Tools then Extensions
  • Remove the “Important Security Alert from Windows” by clicking on the little recycle bin
  • Reset Google Chrome by Deleting the current user to make sure nothing is left behind


  • Open Mozilla Firefox

  • Press simultaneously Ctrl+Shift+A
  • Disable the unwanted Extension
  • Go to Help
  • Then Troubleshoot information
  • Click on Reset Firefox


  • Open Internet Explorer

  • On the Upper Right Corner Click on the Gear Icon
  • Click on Internet options
  • go to Toolbars and Extensions and disable the unknown extensions
  • Select the Advanced tab and click on Reset


  • Restart Internet Explorer

Step 4: Undo the damage done by “Important Security Alert from Windows”

This particular Virus may alter your DNS settings.

Attention! this can break your internet connection. Before you change your DNS settings to use Google Public DNS for “Important Security Alert from Windows”, be sure to write down the current server addresses on a piece of paper.

To fix the damage done by the virus you need to do the following.

  • Click the Windows Start button to open the Start Menu, type control panel in the search box and select Control Panel in the results displayed above.
  • go to Network and Internet
  • then Network and Sharing Center
  • then Change Adapter Settings
  • Right-click on your active internet connection and click properties. Under the Networking tab, find Internet Protocol Version 4 (TCP/IPv4). Left click on it and then click on properties. Both options should be automatic! By default it should be set to “Obtain an IP address automatically” and the second one to “Obtain DNS server address automatically!” If they are not just change them, however if you are part of a domain network you should contact your Domain Administrator to set these settings, otherwise the internet connection will break!!!

You must clean all your browser shortcuts as well. To do that you need to

  • Right click on the shortcut of your favorite browser and then select properties.


  • in the target field remove “Important Security Alert from Windows” argument and then apply the changes.
  • Repeat that with the shortcuts of your other browsers.
  • Check your scheduled tasks to make sure the virus will not download itself again.

How to Permanently Remove “Important Security Alert from Windows” Virus (automatic) Removal Guide

Please, have in mind that once you are infected with a single virus, it compromises your system and let all doors wide open for many other infections. To make sure manual removal is successful, we recommend to use a free scanner of any professional antimalware program to identify possible registry leftovers or temporary files.

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