Removal Guide

Remove Ads by CostItApp from Chrome/Firefox

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.

Are you infected by Ads by CostItApp? We can help you remove Ads by CostItApp from Chrome, Mozilla and Internet Explorer.

Remove Ads by CostItApp

Remove Ads by CostItApp

Ads by CostItApp is a potentially unwanted application that behaves in a way similar to an Adware virus. Until you remove it from your computer you can expect to have large amounts of advertisement thrown at you. This can come in the form of banners or pop-ups, but can also be autonomous pages. They will load whenever you start your internet browser or load a page/tab within it. You may also see certain words turn into hyperlinks – another form of Ads.

You want Ads by CostItApp removed from your computer. It can cause slowdowns and sluggishness, because the CPU has to effectively load two pages when you browse. The Ads will also require extra bandwidth, so the slowdown may be even more severe if your download speed is slow.

Do not click on the Ads

Interacting with the Ads may cause significant risk for your computer. The sites they lead to are often frauds made to look exactly like well known sites. They will also employ very similar URLs to the originals they are impersonating, which makes telling fake from real a difficult task.

Further any file offered by Ads by CostItApp will most likely be a virus or some form of scam. Beforehand you might see pop-ups about some kind of problem – be it viruses, registry errors or missing plug-ins. The goal is to make you believe the problem is urgent. You will then be offered to download some program that will fix the problem for you, but in fact it will be an another virus.

Remember that viruses come exclusively in the form of executable (.exe) files. That’s why you should never trust a file downloaded from a random location. The name of the executable file doesn’t really matter. There are dangerous sites like online storage/torrent sites. These might present to you multiple download buttons, but no more then one will actually work. The rest will contain a file that carries a name matching your search terms, will be an (.exe) file and will actually be a virus.

Remove Ads by CostItApp

Viruses constantly evolve due to the effort of their creators to make them harder to remove. This means that at any time there many be multiple existing versions of Ads by CostItApp. This guide aims to deal with all versions, but this also means some of the Steps may be redundant. If any of these steps produces no result and you are sure you have followed the guide correctly feel free to just skip ahead.


Our first step here is a reboot in Safe Mode. If you already know how to do it, just skip this and proceed to Step 2. If you do not know how to do it, continue reading:

For Windows 98, XP, Millenium and 7 Users:

Restart your computer. To be sure you don’t miss the time when you need to press it, just spam F8 as soon as the PC starts booting. In the new menu, choose Safe Mode With Networking.


Proceed to Step 2.

For W. 8 and 8.1 Users:

Click the Start button Picture of the Start button, then Control Panel —> System and Security —> Administrative Tools —> System Configuration.Administrator permission required


Then check the Safe Boot option and click OK.  Click  Restart in the new pop-up.

system- config

Proceed to Step 2.


Ads by CostItApp is perfectly capable of infecting all of your browsers. You will have to run Step 2 and Step 3 for every browser installed on your computer.

There may be other viruses installed on your computer due to Ads by CostItApp. Have you installed any file offered by Ads by CostItApp? This includes all kinds of tricks. Java/Flash updates, offers to download free software, codecs, video player. Sometimes you may even be presented with fake messages about errors or viruses and offered to download a free solution. Try to remember the name – if it is a virus you will want it removed and fast.

ie9-10_512x512  For Internet Explorer Users:

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

pic 3

Find Ads by CostItApp . Remove it by pressing Disable.

If your Home Page is different from the usual, click IE GEAR —–> Internet Options>edit the URL box with your preferred search engine, and click Apply.

firefox-512  For Mozilla Firefox Users:

Open Firefoxclick on mozilla menu (top right) ——-> Add-ons.

pic 5.

Hit Extensions next.

Get Rid Of Ads by CostItApp

Ads by CostItApp  should be somewhere around here –  Remove it.

chrome-logo-transparent-background For Google Chrome Users

 Start Chrome, click chrome menu icon —–>More Tools —–> Extensions.


pic 7

In  Extensions,  find the virus and  select  chrome-trash-icon(Remove).

Remove Ads by CostItApp From Chrome

 Click chrome menu icon again, and proceed to Settings —> Search, the fourth tab, select Manage Search Engines.  Remove anything but the search engines you normally use.

pic 9

safari For Safari Users:

Open Safari, and click Safari —–>Preferences —–> Extensions—–>Uninstall the malware.


Right click on the browser’s shortcut, then click Properties.

NOTE: We are showing Google Chrome, but the method is the same for all browsers.


Once you’ve reached Properties —–> Shortcut (on the band at the top), then in the Target type field, REMOVE EVERYTHING AFTER .exe.


(Works for Windows XP, 7,  8,  8.1)

Hold windows-buttonand R together. Write appwiz.cpl  in the new field, then click OK.


You are now in the Control Panel. Search around for Ads by CostItApp and anything else suspicious-looking. Uninstall  it/them. Also, be extremely careful. Viruses often spend one last ditch effort to trick you into installing more of their kind. If you see a screen like this when you click Uninstallchoose NO:


Hold windows-buttonand R again – but this time copy + paste the following and click OK:

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

A .txt file will open – don’t touch anything there. If you are hacked and someone has access to your PC, there will be a bunch of other IPs connected to you at the bottom. This is what a hosts file looks like:

hosts_opt (1)

If there is anything connecting to you below “Localhost” you may be hacked, and it’s best to ask us in the comments for directions.


Open the Task Manager by right clicking on the Taskbar and choosing Start Task Manager.


Once it opens, choose the Processes Tab. Look at all of the processes in front of you and try to determine which ones are a virus. Google them or ask us in the comments and we will provide the best assistance we can.


This is probably the most difficult step of the whole guide. Doing it wrong can damage your Windows installation significantly. If you are not feeling comfortable, we advise you to download a professional anti-malware program that can remove Ads by CostItApp for you. You’ll be terminating the virus process and deleting virus files, but if you select a wrong process, things can go south pretty quickly.

If you do not remove the virus completely it could leak information about your habits, credit card numbers and passwords to its creator, so be careful!


Right click on each of the virus processes separately and select Open File Location. Also, End the process after you open the folder. Just to make sure we don’t delete any programs you mistakenly took for a virus, copy the folders somewhere, then delete the directories you were sent to.


Take a look at the following things:

Type msconfig in the search field and hit enter: you will be transported to a new window. 


Go in the Startup tab and Uncheck anything that has “Unknown” as Manufacturer.

Type Regedit in the windows search field and press Enter.

Once inside, press CTRL and F together and type the virus’s Name. Right click and delete any entries you find with a similar name. If you can’t find them this way, look in these directories, and delete the registries manually:

  • HKEY_CURRENT_USER—-Software—–Random numbers
    HKEY_CURRENT_USER—-Software—Microsoft—-Windows—CurrentVersion—Run– Random
    HKEY_CURRENT_USER—-Software—Microsoft—Internet Explorer—-Main—- Random

Did we help you? Please, consider helping us by spreading the word!

STEP 7 – Optimization

We’ve prepared a short and sweet optimization guide, specifically designed for users who just removed a virus. It is completely free, you do not need to download anything, and it’s not very time consuming. If you are interested – How To Remove Guide’s Optimization Tips.


Leave a Comment