Ads Removal

Reaction Setup “Virus” Removal (July 2018 Update)

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. 

Download SpyHunter Anti-Malware

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

How irritating is this problem? (1 votes, average: 5.00)

This page aims to help you remove Reaction Setup “Virus”. Our removal instructions work for Chrome, Firefox and Internet Explorer, as well as every version of Windows.

If your browser is experiencing unusually intense and overwhelming generation of online ads and if those ads seem to stick to your browser and not go away regardless of what site you go to, then you most probably have an adware on your hands and on your browser. Adware is a specific group of software programs, applications and browser components that mainly exist to serve the purposes of the online advertising industry. There are many adware apps out there but in this particular case we will be focusing on Reaction Setup “Virus”, as this is one of the newest additions to this software family and a big number of users are currently struggling with the irritating pop-ups, banners, box messages and page redirects that this potentially unwanted software piece is likely to generate. The effects of Reaction Setup “Virus” could reach any browser – Chrome, IE, Opera, Edge Firefox and pretty much all other popular browser can get infiltrated by this pesky program and could start getting spammed with all kinds of advertising materials. In case you have recently realized that the Reaction Setup adware app is on your PC and browser as well, it might be a good idea to read all of the following information. We have done our best to provide our readers with relevant and useful details regarding this unpleasant adware-related issue as well as to show how this unwanted software can be quickly and easily removed from any computer. If any of this interests you and you’d like to learn more, make sure to stay with us until the end of this write-up.

Characteristics of adware programs

Initially, an adware app might appear to be no different from any other extension for a browser. Once installed, the adware would typically get added to the user’s default browsing program and operate from there. In many instances, the developers of the adware might even promote their product as useful and helpful addition to any browser and, truth be told, in some rare cases an adware piece of software might indeed hold certain beneficial features. In such a case, it’s up to the user’s judgement whether the app should be allowed to stay on the computer.

Reaction Setup “Virus” 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 Reaction Setup 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 Reaction Setup from Firefox:

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

pic 6

Find the adware/malware —> Remove.
chrome-logo-transparent-backgroundRemove Reaction Setup 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!

However, sadly, such instances are more or less an exception to the general rule which is that adware apps are mostly unwanted software components and it is typically better to have them removed sooner than later. Usually, the endless stream of ads and browser redirects are more than enough of a reason for the majority of users to quickly start seeking methods for uninstalling the pesky application from their browsers. In fact, it is likely that this is precisely how you have stumbled upon this article. One thing that still needs to be mentioned with regards to the adware family, though, is that most representatives of this software group aren’t malicious in themselves. Adware is primarily advertising-oriented and is hardly ever used to carry out anything harmful. Categorizing programs like Reaction Setup as viruses is technically incorrect as there are quite a few significant differences between adware apps/programs and malware viruses such as Trojan Horses, Rootkits, Spyware, Ransomware and so on. However, if you don’t want to land some nasty Ransomware or Trojan Horse virus, it is advisable that you do away with the adware that’s currently on your PC because of its uncontrolled stream of ads directed towards your browser. It is always a security risk to have random ads pop-up on your screen and clutter your browser because in many instances such ads tend to be used for malware distribution. Malvertising is, in fact, one of the top most popular methods used by all kinds of cyber criminals for spreading different forms of hazardous and harmful software. Therefore, once again, we advise you to get rid of Reaction Setup using our guide from this page or the recommended anti-malware tool that we have added to the said guide.

The installation of an adware program

There are indeed a number of ways one could get an adware installed on their computer. Clicking on some sketchy web ad or opening a spam e-mails attachment as well as visiting obscure and questionable web locations can all get your machine filled with carious undesirable apps the likes of Reaction Setup “Virus”. However, one other method for distribution of unwanted programs that many users ignore and overlook is the file-bundling. As you might know, the installers of a lot of programs offer you to also install some other “bonus” app or browser component on your PC. Such added components are actually very commonly adware or browser hijacker apps which is why it’s very important that you make sure to uncheck such optional installs when going through the setup wizard of a new program if they seem unreliable and potentially unwanted. Also, never forget to check the Advanced setup menu as this might be where the options related to the bundled apps might be hidden.


Name Reaction Setup
Type  Adware
Danger Level Medium (nowhere near threats like Ransomware, but still a security risk)
Symptoms Irritating ads all over your screen is the most typical symptom.
Distribution Method Spam messages with shady content, software bundles, pirated downloads and so on.
Detection Tool

Leave a Comment