How to remove the questdns virus

Most antivirus programs identify questdns.exe as malware—for example Sophos identifies it as Zwangi, and Symantec identifies it as Heuristic.ADH.

The free file information forum can help you find out how to remove it. If you have additional information about this file, please leave a comment or a suggestion for other users.

Click to Run a Free Virus Scan for the questdns.exe malware

Questdns.exe file information

Windows Task Manager with questdns
Questdns.exe process in Windows Task Manager

The process known as questdns.exe belongs to software QuestDns by

Description: Questdns.exe is not essential for Windows and will often cause problems. The questdns.exe file is located in a subfolder of "C:\Program Files". Known file sizes on Windows 10/8/7/XP are 57,600 bytes (50% of all occurrences) or 61,704 bytes. 
There is no information about the author of the file. The program is not visible. The file has a digital signature. The questdns.exe file is not a Windows system file. Therefore the technical security rating is 46% dangerous.

Uninstalling this variant: If problems with QuestDns come up, you could also safely remove the program using the uninstall program of (Control Panel ⇒ Uninstall a Program).

Recommended: Identify questdns.exe related errors

Important: You should check the questdns.exe process on your PC to see if it is a threat. If questdns.exe has changed your browser's search engine and start page, you can recover your browser's default settings as follows:

Reset default browser settings for Internet-Explorer ▾
  1. In Internet Explorer, press the key combination Alt + X to open the Tools menu.
  2. Click Internet options.
  3. Click the Advanced tab.
  4. Click the Reset... button.
  5. Enable the Delete personal settings option.
This will reset your Internet Explorer to its default settings. Your browser will start with the familiar start page and search engine—without popups, ads, cookies, but all browser add-ons are deleted too [1]. Make cleaning up your browser and your computer simpler and safer with Security Task Manager.


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Best practices for resolving questdns issues

The following programs have also been shown useful for a deeper analysis: Security Task Manager examines the active questdns process on your computer and clearly tells you what it is doing. Malwarebytes' well-known anti-malware tool tells you if the questdns.exe on your computer displays annoying ads, slowing it down. This type of unwanted adware program is not considered by some antivirus software to be a virus and is therefore not marked for cleanup.

A clean and tidy computer is the key requirement for avoiding PC trouble. This means running a scan for malware, cleaning your hard drive using cleanmgr and sfc /scannow, uninstalling programs that you no longer need, checking for Autostart programs (using msconfig) and enabling Windows' Automatic Update. Always remember to perform periodic backups, or at least to set restore points.

Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

Other processes

questdns.exe [all]