What is questscan.dll?

Questscan.dll is a Windows DLL file. DLL is the abbreviation for Dynamic Link Library. DLL files are needed by programs or web browser extensions, because they contain program code, data, and resources. The following information can help you determine if questscan.dll is a Windows system file or if it belongs to an application that you can trust.

Click to Run a Free Scan for questscan.dll related errors

Questscan.dll file information

The process known as questscan.dll appears to belong to software QuestScan (version 1.0 build 181 powered by FIRST, 1.0 build 129 powered by, 1.0 build 189 powered by FIRST, 1.0 build 181 powered by, 1.0 build 143 powered by FIRST) by unknown.

Description: Questscan.dll is not essential for Windows and will often cause problems. The questscan.dll file is located in a subfolder of "C:\Program Files". Known file sizes on Windows 10/8/7/XP are 573,440 bytes (18% of all occurrences), 1,019,904 bytes and 5 more variants. 
A .dll file (Dynamic Link Library) is a special type of Windows program containing functions that other programs can call. This .dll file can be injected to all running processes and can change or manipulate their behavior. There is no information about the author of the file. The program has no visible window. There is no detailed description of this service. The questscan.dll file is not a Windows system file. It can change the behavior of other programs or manipulate other programs. Therefore the technical security rating is 83% dangerous.

Uninstalling this variant: You can uninstall the associated program (Start > Control Panel > Uninstall a Program > QuestScan or QuestScan 1.0 build 181 powered by FIRST).

Recommended: Identify questscan.dll related errors

Important: Some malware also uses the file name questscan.dll, for example Generic.dx!zqu or Artemis!6ECACF40CB1C (detected by McAfee), and Zwangi (detected by Sophos). Therefore, you should check the questscan.dll process on your PC to see if it is a threat. If questscan.dll 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 questscan issues

The following programs have also been shown useful for a deeper analysis: Security Task Manager examines the active questscan process on your computer and clearly tells you what it is doing. Malwarebytes' well-known anti-malware tool tells you if the questscan.dll 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

questscan.dll [all]