How to Remove Ads by Undefined Manually

Posted by John Larkin - August 25, 2016

What is Undefined?

If you see a variety of pop-up windows, there is no doubt that your system is infected with an adware. Undefined, released by unknown developers, is a latest adware. Unfortunately, it has high compatibility and can hijack all kinds of web browsers, which means that you will not be able to avoid its pop-up ads when you go online. The only solution is to completely remove Undefined from the computer system. If you do so, there is no doubt that all the annoying pop-up ads will disappear and you will be able to browse the web safely and effectively without interruption.

Some of its ads may look good, but you should not click on them, because they may take you to unsafe web sites and you may encounter malware that can seriously infect your computer system. Undefined is similar to some other adware infections such as AA and BB. If you find pop-up ads in the computer screen, you should remove it without having any further consideration. It seems that you do not download it but you download a free program. In fact, it is just bundled with some free programs. Computer users who want to protect the computer system should remove Undefined timely.

Why You Need to Remove Undefined Pop-up Ads?

Once Undefined is active on your computer, it will cause many annoying problems, such as,

1. It displays many pop-up ads or notifications labeled as “Powered by Undefined”, “Brought by Undefined” etc.

2. It installs unwanted add-ons and plug-ins to your web browsers.

3. It highlights some keywords on the web page you’re browsing.

4. It takes more time to load a web page and slows down your browsing.

5. It can spy on your online activities and collect useful personal information for unethical purposes.

Fix 1: Automatically Remove Undefined Pop-up Ads

Automatic removal of Undefined pop-up ads is recommended, as this professional Automatic Removal Tool can fully detect, identify and delete all bad files and components of Undefined. This is extremely helpful for those who don’t want to take the risk and trouble to perform manual removal. Click and download this professional Automatic Removal Tool below.

Fix 2: Manually Remove Undefined Pop-up Ads

If you’re comfortable with manually removing Undefined pop-up ads, please perform the removal steps below in the exact order so as to get a successful removal.

1. Disconnect the network and click on Start button then go to Control Panel. Click Uninstall a program.

2. Click Installed On tab so as to sort the programs by installed date.

3. Check programs that were not installed by yourself on your computer, right click on it and then select Uninstall.

Undefined could run on different browsers so as to generate pop-up ads to disturb users. You can remove Undefined from your browser and clean off unwanted ads.

Remove Undefined from Internet Explorer

1. Run Internet Explorer, click Tools and select Manage Add-ons.

2. Select Undefined or other unfamiliar add-ons and then click Disable button.

Remove Undefined from Google Chrome

1. Run Google Chrome, click on Chrome Menu icon, move your mouse to More Tools and then select Extensions

2. Find Undefined and other malicious toolbars or extensions that cause pop-ups and then click the Trash button.

Remove Undefined from Mozilla Firefox

1. Run your Mozilla Firefox, click on Tools and select Add-ons.

2. Find Undefined and other malicious toolbars or extensions that cause pop-ups and then then click Remove button.

Undefined is able to affect Windows system by modifying entries to Registry Editor which is basically the database for all operations on computers. To completely solve the problem, the following will show you to remove the malicious entries.

1. Hit Win key and R key on the keyboard at the same time.

2. Type into the command regedit on the Run window and click OK button.

3. Navigate to the following location in the Registry Editor and check the entries.


If computers get infected with Undefined, the network will be affected possibly. If you cannot visit websites normally, you can change your DNS servers settings.

1. Right click on the network system icon the taskbar notification area on the desktop. Click Open Network and Sharing Center.

2. Click in your active network connection. That may be Local Area Connection or Wireless Network Connection.

3. Select Properties.

4. Double click the Internet Protocol Version 4(TCP/IP).

5. Click Advanced

6. Click DNS tab. Click on the DNS servers addresses, click Remove button to remove them one by one. After that, click Add button to add the IP addresses of the Google DNS servers.

7. Type in or and then click Add to save the change.

8. Click OK.

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