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What does the rundll33.exe file do?

The rundll33.exe process is also known as Run a DLL as an App and is a part of Microsoft Windows Operating System. This software is produced by Microsoft (www.microsoft.com). An obsolete or defective version of rundll33.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 rundll33.exe Run a DLL as an App

rundll33.exe is not a Windows system file and is known to frequently cause computer problems. Rundll33.exe is found in a subdirectory of C:\Windows\System32. Frequently occurring are file sizes such as 50,688 bytes (66% of all these files) or, as the case may be, 33,280 bytes.
It is no part of Microsoft Windows. It is interesting to note that the file is placed in the Windows folder, even though it is not part of the operating system. The program executes in the background, and can only be terminated using Windows Task Manager. For this reason, 28% of all experts consider this file to be a possible threat. The probability that it can cause harm is high.

A rundll33.exe file has a 64% certainty of being dangerous if it is found in a subdirectory of C:\. In this case, the file size is usually 6,241,792 bytes. There is no internal description of the file. The program executes in the background, and can only be terminated using Windows Task Manager. Windows starts the process each time that the computer boots up (Registry: Run). The file does not come from Microsoft and is not part of the operating system.

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 rundll33.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 rundll33?

It's a part of TSPY.POPHOT.VP
james

Summary: For this reason, one user has already deleted rundll33.exe. source: file.net

How to uninstall the program

rundll33.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 in the list of available programs.
  5. Click Uninstall.

How to tell if rundll33.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 rundll33.exe is causing problems for you, a good Windows diagnostic tool 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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