What is scan.dll?

Scan.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 scan.dll is a Windows system file or if it belongs to an application that you can trust.

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Scan.dll file information

The process known as BitDefender Threat Scanner or Defender Pro ThreatScanner or Security Shield (version 2009 ThreatScanner) or The Shield Deluxe (version 2009 ThreatScanner) or Tetra ThreatScanner

belongs to software BitDefender Threat Scanner (scan) or BitDefender or BitDefender Antivirus (version 2009, 2010) or BitDefender Total Security (version 2009) or Security Shield (version 2009) or The Shield Deluxe (version 2009) or Defender Pro (version 15-in-1) or RPS PerfectDiskStub

by S.C. BitDefender S.R.L ( or PCSecurityShield ( or Bitdefender ( or S.C. Defender Pro S.R.L or Immunet (

Description: Scan.dll is not essential for the Windows OS and causes relatively few problems. Scan.dll is located in a subfolder of "C:\Program Files". Known file sizes on Windows 10/8/7/XP are 326,224 bytes (31% of all occurrences), 327,680 bytes and 4 more variants. 
The service can be started or stopped from Services in the Control Panel or by other programs. The program is not visible. The process is not active. It is not a Windows core file. Scan.dll is able to monitor applications and manipulate other programs. Therefore the technical security rating is 1% dangerous; however you should also read the user reviews.

Uninstalling this variant: It is possible to do the following:
  • search the support area on the Radialpoint website
  • uninstall RPS RpsCore or TELUS security services software via Windows Control Panel/Add or Remove Programs (Windows XP) or Programs and Features (Windows 10/8/7)

Recommended: Identify scan.dll related errors

If scan.dll is located in a subfolder of "C:\Program Files\Common Files", the security rating is 4% dangerous. The file size is 323,584 bytes (60% of all occurrences), 311,296 bytes or 151,552 bytes. The program has no visible window. The process is not active. The service has no detailed description. The scan.dll file is not a Windows core file. You can uninstall this program in the Control Panel.

Uninstalling this variant: It is possible to uninstall BitDefender Antivirus 2009 or BitDefender Antivirus 2010 software via Windows Control Panel/Add or Remove Programs (Windows XP) or Programs and Features (Windows 10/8/7).

Important: Some malware camouflages itself as scan.dll, particularly when located in the C:\Windows or C:\Windows\System32 folder. Therefore, you should check the scan.dll process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.


User Comments

registry. If the missing DLL file is a non-Windows file, so scan registry file and preloaded scan.dll file value changed 1 ya 0

Summary: Average user rating of scan.dll: based on 1 vote with 1 user comment. One user thinks scan.dll is essential for Windows or an installed application.

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Best practices for resolving scan issues

A clean and tidy computer is the key requirement for avoiding problems with scan. This means running a scan for malware, cleaning your hard drive using 1cleanmgr and 2sfc /scannow, 3uninstalling programs that you no longer need, checking for Autostart programs (using 4msconfig) and enabling Windows' 5Automatic 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 6resmon 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 7DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the scan.dll process on your computer, the following programs have proven to be helpful: ASecurity Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. BMalwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

scan.dll [all]