Most antivirus programs identify rundll16.exe as malware.
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Description: Rundll16.exe is not essential for Windows and will often cause problems. The file rundll16.exe is located in the C:\Windows folder.
Known file sizes on Windows 8/7/XP are 18,944 bytes (50% of all occurrences) or 51,712 bytes.
There is no file information. The program is not visible. Rundll16.exe is located in the Windows folder, but it is not a Windows core file. The software starts when Windows starts (see Registry key: MACHINE\RunServices, MACHINE\Run, Userinit). It is not a Windows system file. Rundll16.exe is able to record keyboard and mouse inputs and monitor applications. Therefore the technical security rating is 80% dangerous; however you should also read the user reviews.
Recommended: Identify rundll16.exe related errors
External information from Paul Collins:
There are different files with the same name:
Important: You should check the rundll16.exe 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.
A clean and tidy computer is the key requirement for avoiding problems with rundll16. 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 doing a repair of your installation, or in the case of Windows 8, executing the DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.
To help you analyze the rundll16.exe process on your computer, the following programs have proven to be helpful: Security 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. Malwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.