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Google Critical Security Alert

Parasite may reinstall itself multiple times if you don't delete its core files. We recommend downloading SpyHunter to scan for malicious programs installed with it. This may save you hours and cut down your time to about 15 minutes. 

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More information on SpyHunter, steps to uninstallEULAThreat Assessment Criteria, and Privacy Policy.

Google Critical Security Alert

Critical Security Alert is a typical browser hijacker representative and it is one of the newest additions to this software family. Despite its fairly recent release, a considerable number of users have already complained about its unwelcome presence on their systems and also about the unpleasant browser modifications that it is trying to enforce.

Faced with unwanted changes to your browsing program and intrusive online ads and page redirects that don’t seem to go away no matter what you do to get rid of them? If that is your current situation, we might be able to help you overcome this issue and bring things back to their normal state. In case your browser (Firefox, Edge, Opera, Chrome or any other) has recently started to behave oddly and/or has had its starting page, new-tab page and search engine replaced without your approval, then you most likely have a browser hijacker on your hands. A browser hijacker is a software app that initially seems to function similarly to a regular browser extension. However, there are several important differences between most browser extensions and the majority of hijackers. The main difference is that hijackers are normally regarded as unwanted because of their ability to impose changes on the user’s browser without first asking for the user’s permission to do so. Furthermore, the said changes are typically undesirable and instead of making one’s online experience more pleasant and/or better optimized, they actually ten to only get in the way and annoy the user. Also, as we already mentioned, a typical hijacker is also likely to fill your browser with pesky advertising materials and redirects to random and unknown pages which is yet another reason why the majority of users would prefer to remove any hijacker app from their system once they find out they have had such an app installed and added to their browser. Another factor that contributes to the rather unpleasant nature of most hijackers is the way they tend to get installed – in most cases this happens without the user’s knowledge since the methods that are mainly used for distribution of browser hijackers tend to be rather stealthy ans sneaky (more on that, later). All things considered, if you currently have a hijacker app on your machine, it is likely that you’d prefer to have it removed in the fastest way possible. Luckily for you, we can help you with that – at the bottom of this write-up, we will show you how to remove Critical Security Alert. If you are one of the numerous victims of this annoying software behavior, feel free to use our guide and/or the recommended removal tool added to it in order to uninstall the pesky app.

How dangerous can hijackers be?

Most of the time, a hijacker software component like Critical Security Alert wouldn’t directly threaten anything on your machine. Despite their rather obstructive and, at times, obnoxious nature, most hijackers are actually relatively harmless as far as one’s system security is concerned. They are certainly not viruses like Trojans and Ransomware and their purpose is also not associated with any illegal or criminal activities. Most hijackers are used for online advertising campaigns and will not go out of their way to do anything damaging to your computer. However, there are still certain risks you ought to be aware of. A browser hijacker’s adverts and redirects may not be the safest type of online content and you are advised to not interact with them for that reason. Oftentimes, the developer of the hijacker app is not responsible for the quality or the safety of the displayed advertising materials which means that there could easily be adverts that might land you on shady and even hazardous web locations, should you interact with the said ads. Therefore, it’s simply best if you avoid the hijacker-related content and get rid of the intrusive software piece so as to avoid getting your computer exposed to real cyber threats – Ransomware, Spyware, Trojan Horses, Worms, Rootkits, etc.

Why its important to customize the installation of new software

One of the most common reasons why users tend to get hijackers installed on their machines is because they disregard the importance of carefully customizing the setup settings when installing a new program. You see, in many cases, browser hijackers or other similar unwanted software get bundled with some other program in the form of an optional install. However, if you don’t want that optional install on your PC, you’d normally need to opt-out of it and this option is oftentimes only available under the Advanced/Custom setup menu. Therefore, from now on, whenever you are about to install any new software on your computer, make sure to check the advanced setup menu and uncheck anything that you might not want to become a part of your system.

Name Critical Security Alert
Type Browser Hijacker
Danger Level Medium (nowhere near threats like Ransomware, but still a security risk)
Symptoms Typical symptoms of a hijacker are different kinds of browsing disturbance caused by the unwanted changes to the browser and by the irritating page redirects and generation of ads.
Distribution Method File-bundles, spam messages with attached files and links, sketchy and deceitful online ads, torrents, questionable sites and others.
Detection Tool

Critical Security Alert Removal

If you have a Windows virus, continue with the guide below.

If you have a Mac virus, please use our How to remove Ads on Mac guide.

If you have an Android virus, please use our Android Malware Removal guide.

If you have an iPhone virus, please use our iPhone Virus Removal guide


Some of the steps will likely require you to exit the page. Bookmark it for later reference.

Reboot in Safe Mode (use this guide if you don’t know how to do it).



We get asked this a lot, so we are putting it here: Removing parasite manually may take hours and damage your system in the process. We recommend downloading SpyHunter to see if it can detect parasite files for you.

Press CTRL + SHIFT + ESC at the same time and go to the Processes Tab (the “Details” Tab on Win 8 and 10). Try to determine which processes are dangerous. 


Right click on each of them and select Open File Location. Then scan the files with our free online virus scanner:

Drag and Drop Files Here to Scan
Maximum file size: 128MB.

This scanner is free and will always remain free for our website's users. You can find its full-page version at:

Scan Results

Virus Scanner Result

After you open their folder, end the processes that are infected, then delete their folders. 

Note: If you are sure something is part of the infection – delete it, even if the scanner doesn’t flag it. No anti-virus program can detect all infections. 


Hold together the Start Key and R. Type appwiz.cpl –> OK.


You are now in the Control Panel. Look for suspicious entries. Uninstall it/them.

Type msconfig in the search field and hit enter. A window will pop-up:


Startup —> Uncheck entries that have “Unknown” as Manufacturer or otherwise look suspicious.


Hold the Start Key and R –  copy + paste the following and click OK:

notepad %windir%/system32/Drivers/etc/hosts

A new file will open. If you are hacked, there will be a bunch of other IPs connected to you at the bottom. Look at the image below:

hosts_opt (1)

If there are suspicious IPs below “Localhost” – write to us in the comments.

Open the start menu and search for Network Connections (On Windows 10 you just write it after clicking the Windows button), press enter.

  1. Right-click on the Network Adapter you are using —> Properties —> Internet Protocol Version 4 (ICP/IP), click  Properties.
  2. The DNS line should be set to Obtain DNS server automatically. If it is not, set it yourself.
  3. Click on Advanced —> the DNS tab. Remove everything here (if there is something) —> OK.



  • After you complete this step, the threat will be gone from your browsers. Finish the next step as well or it may reappear on a system reboot.

Right click on the browser’s shortcut —> Properties.

NOTE: We are showing Google Chrome, but you can do this for Firefox and IE (or Edge).


Properties —–> Shortcut. In Target, remove everything after .exe.

ie9-10_512x512  Remove Critical Security Alert from Internet Explorer:

Open IE, click  IE GEAR —–> Manage Add-ons.

pic 3

Find the threat —> Disable. Go to IE GEAR —–> Internet Options —> change the URL to whatever you use (if hijacked) —> Apply.

firefox-512 Remove Critical Security Alert from Firefox:

Open Firefoxclick  mozilla menu  ——-> Add-ons —-> Extensions.

pic 6

Find the adware/malware —> Remove.
chrome-logo-transparent-backgroundRemove Critical Security Alert from Chrome:

Close Chrome. Navigate to:

 C:/Users/!!!!USER NAME!!!!/AppData/Local/Google/Chrome/User Data. There is a Folder called “Default” inside:

Rename the Folder to Backup Default

Rename it to Backup Default. Restart Chrome.


To remove parasite on your own, you may have to meddle with system files and registries. If you were to do this, you need to be extremely careful, because you may damage your system.

If you want to avoid the risk, we recommend downloading SpyHunter
a professional malware removal tool.

More information on SpyHunter, steps to uninstallEULAThreat Assessment Criteria, and Privacy Policy.

Type Regedit in the windows search field and press Enter.

Inside, press CTRL and F together and type the threat’s Name. Right click and delete any entries you find with a similar name. If they don’t show up this way, go manually to these directories and delete/uninstall them:

  • HKEY_CURRENT_USER—-Software—–Random Directory. It could be any one of them – ask us if you can’t discern which ones are malicious.
    HKEY_CURRENT_USER—-Software—Microsoft—-Windows—CurrentVersion—Run– Random
    HKEY_CURRENT_USER—-Software—Microsoft—Internet Explorer—-Main—- Random

If the guide doesn’t help, download the anti-virus program we recommended or try our free online virus scanner. Also, you can always ask us in the comments for help!

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