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What does the rundll32.exe file do?

The rundll32.exe process is also known as Run a DLL as an App or, as the case may be, Windows host process (Rundll32) and is a part of Microsoft Windows Operating System or, as the case may be, Betriebssystem Microsoft Windows. This software is produced by Microsoft (www.microsoft.com) or, as the case may be, Ocf. An obsolete or defective version of rundll32.exe can cause problems for your computer that can range from slowness to error messages such as these:

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What you should know about rundll32.exe Run a DLL as an App

rundll32.exe is a Windows system file. Rundll32.exe is found in the C:\Windows\System32 directory. Frequently occurring are file sizes such as 33,280 bytes (78% of all these files), 44,544 bytes as well as 25 other variants.
To verify its trustworthiness, Microsoft has provided it with an embedded certificate. For this reason, 8% of all experts consider this file to be a possible threat. The probability that it can cause harm is high.

rundll32.exe is a system file used by Microsoft Windows, and appears in Windows Task Manager as a process named "Run a DLL as an App." However, some viruses or Trojans use the same file name in order to remain undetected (such as Trojan:Win32/Malat or, as the case may be, Worm:Win32/Babonock.A (recognized by Microsoft), as well as Trojan.Adclicker or, as the case may be, WS.Reputation.1 (recognized by Symantec)).
To be really safe, you should scan your computer with two different anti-virus engines. You can use a free Anti-Malware scanner for this purpose.

Objectionable files with the same file name have the following characteristics:

If you see this file on your hard drive or in Windows Task Manager, please make sure that it is not a malicious variant. It's a fact that many trojans try to cloak their true identity by calling themselves rundll32.exe. With the above information or by using tools like Security Task Manager you can determine if, in your case, the file is an undesirable variant.

What do other computer users say about rundll32?

RunDLL32 is used to run DLLs as programs
Alex
For some reason this program is hung in background and is stopping certain programs from opening.
Ryan
Multiple instances of RUNDLL32 may be running on your pc at one time. Some of these may or may not be the legitimate versions. (further information...)
SID JUSTICE

Summary: 155 users judge rundll32.exe to be an essential file that should not be touched. 19 users consider it harmless. However, 64 users consider this to be a suspicious process and would like to get rid of it. For this reason, 97 users have already deleted rundll32.exe. source: file.net

How to uninstall the program or Betriebssystem Microsoft Windows

rundll32.exe  Run a DLL as an App fix

To remove Run a DLL as an App from your computer, please follow the manual instructions below or use an automatic uninstaller product.

  1. Click the Windows Start Button. In Windows 8, look for Control Panel.
  2. Click Control Panel.
  3. Click Uninstall a program.
  4. Look for the program or Betriebssystem Microsoft Windows in the list of available programs.
  5. Click Uninstall.

How to tell if rundll32.exe (Run a DLL as an App) was uninstalled cleanly

After uninstalling, restart your computer. Then start Windows Explorer and see if there is still a folder with the name of the software under C:\Program Files. Be sure to check the Registry as well for remnants of Run a DLL as an App. To do this, start "Regedit", then look under "HKEY_LOCAL_MACHINE" > "Software" for Run a DLL as an App or the name of the producer. Always keep in mind that only a computer professional should ever directly delete entries in the Windows Registry.

What to do if a program does not uninstall

The easiest way to remove any kind of software cleanly and accurately is to use an uninstaller tool. Because the uninstaller automatically creates a backup, there is no risk of anything going wrong.

Last but not least

If Windows not working quite right for you, or if startup is taking a long time, or rundll32.exe is causing problems for you, a good Registry Cleaner may very well help. This is especially effective when it comes to older computers that have accumulated vast quantities of "garbage data" as the result of many software installs and uninstalls.

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