What Is Rundll?

Significance
The Rundll file, really a small program, usually comes up as a Rundll or Rundll32 error message. When this appears, it means that a file Windows needs to continue operating is corrupt or missing.
Function
Rundll.exe or Rundll32.exe maintains a check on the health of Dynamic Link Library (dll) files, including possible conflicts between different programs on the computer.
Identification
Identifying the Rundll file is a matter of looking in the Windows/System32 folder for a program named 'Rundll32.exe.' However, the more important act is to identify and repair the file that Rundll identifies as a problem.
Benefits
Without this warning method, many software programs now written for Windows would not function, since more than one program makes use of the same Dynamic Link Library files.
Warning
Despite the benefits of Rundll, it also offers an opportunity for hackers seeking access to your computer system. Visit the Microsoft support site to learn more about the security of this program and other features (see Resources).