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.
The file size on Windows 10/8/7/XP is 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. 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.
The following programs have also been shown useful for a deeper analysis: Security Task Manager examines the active rundll16 process on your computer and clearly tells you what it is doing. Malwarebytes' well-known anti-malware tool tells you if the rundll16.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.