Fix Rundll32.exe error in Windows 10 in a few easy steps

Madalina Dinita
by Madalina Dinita
Former Managing Editor
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  • System files are essential for a computer system to operate correctly. It turns out things don’t always go as planned and errors do appear unexpectedly.
  • Rundll32.exe errors are the result of corrupted DLL files, missing DLL files, incorrect DLL entries in the Windows registry, and more.
  • To fix this problem, check your antivirus or use the scannow command as soon as possible.
  • This isn’t the only issue that users had with their computer. Those looking for more useful guides like this one should head over to our detailed Windows 10 errors hub.
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Rundll32.exe files are system processes related to Windows 10‘s functioning. These files are actually part of a code network connecting many programs on your computer.

By reusing the same code for various programs, your system’s processing power and memory increase. Taking into account the vast complexity of such code networks, sometimes errors do appears.

Rundll32.exe errors are mainly caused by corrupted DLL files, missing DLL files, a shared DLL file deleted or infected by a virus or incorrect DLL entries in the Windows registry.

Rundll32.exe error can cause certain problems on your PC. Speaking of this error, users reported the following issues:

  • Rundll32.exe error Windows 10 and prior– This error can appear on any version of Windows, including prior versions. Even if you’re not using Windows 10, you should be able to apply most of our solutions.
  • Rundll32.exe virus, error in pen drive – If you’re getting this error while connecting a pen drive, it’s possible that your pen drive is infected with malware. To fix the problem, use your antivirus tool and perform a detailed scan of your pen drive.
  • Rundll32.exe application error – Sometimes this problem can appear due to your antivirus. To fix the issue, you might have to change a few of your settings and check if that solves the problem.
  • Rundll32.exe error entry point not found, memory could not be written, opening process – There are many problems that can occur due to Rundll32.exe. If you have any of these errors, try running SFC and DISM scans and check if that fixes your problem.
  • Rundll32.exe runtime error, shutdown error – This error can sometimes appear when you try to shut down your PC. If this happens, you might have to perform System Restore and check if that solves the issue.
  • Rundll32.exe error on boot, crash on startup – Sometimes this error can appear as soon as your PC boots. This is a strange problem, but you should be able to fix it by creating a new user account.

What can I do when getting Rundll32.exe error in Windows 10?

1. Replace the corrupted file using Startup Repair

  1. Type Recovery options in the search box > double-click Recovery options.
    Rundll32.exe shutdown error
  2. Go to Advanced startup > Restart now.
    Rundll32.exe error Windows 10
  3. Your computer will launch a blue window > select Troubleshooting.
  4. Select Advanced options > Startup Settings > Restart.
  5. A new list of settings will appear > Select Enable debugging.

Run a third-party DLL fixer

There are plenty of third-party programs out there that promise to fix or replace missing or broken DLLs, and most of them stay true to their word. However, if you are to choose just one, then there’s no way you can go wrong with Restoro.

How to use Restoro to fix missing or broken DLLs

  1. Download here Restoro and install it on your Windows 10 PC
  2. Let Restoro perform a full system scan
  3. When the scan is finished, press Clean Now
    • This is when you will have to activate your license key
    • Before the repair process starts, Restoro will create a restore point of your system in case things go wrong
  4. Restoro will now proceed to fix your DLL-related issue.

Note: While Restoro can be downloaded for free, it has limited functionality until you activate it. That being the case, if you want the full benefit of a great PC repair and optimization tool, you should purchase the full license.

2. Check your antivirus

If you’re getting Rundll32.exe error on your PC, the most likely cause can be your antivirus. Several users reported that the main cause was the sandbox feature of their antivirus.

According to users, Rundll32.exe was added to the sandbox on their antivirus and that caused the issue to appear. In order to solve the problem, you need to remove Rundll32 from the sandbox and check if that solves the problem.

Users reported this problem with Avast, but the issue can also appear with other antivirus tools that support the sandbox feature.

If changing the antivirus settings doesn’t solve the issue, you might have to remove your antivirus. There are several ways to do that, but the best one is to use a dedicated removal tool.

You can download the antivirus removal tool from your antivirus developer for free. Once you remove the antivirus, check if the issue still persists. If not, it means that your antivirus was causing the problem.

To ensure that the problem doesn’t reappear in the future, it’s advised to switch to a different antivirus solution. Here’s a list of our top picks.

3. Use the scannow command

Sometimes this problem can occur due to file corruption. File corruption can appear for various reasons, and if you have problems with Rundll32.exe error, you might be able to fix the issue by running the SFC scan.

To do that, just follow these steps:

  1. Press Windows Key + X to open Win + X menu. Now choose Command Prompt (Admin) or PowerShell (Admin) from the list.
    Rundll32.exe application error
  2. Now enter sfc/scannow and press Enter to start SFC scan.
    Rundll32.exe error on boot
  3. Keep in mind that this scan can take about 15 minutes or more, so don’t interfere with it.

Once the scan is finished, check if the problem still persists. If you can’t run an SFC scan or if the issue is still present, you might be able to fix the problem by running the DISM scan instead.

To do that, follow these steps:

  1. Start Command Prompt as administrator.
  2. Enter and run DISM /Online /Cleanup-Image /RestoreHealth command.
    Rundll32.exe error memory could not be written
  3. DISM scan will now start. It’s worth mentioning that this scan can take more than 20 minutes, so don’t interrupt it.

Once the DISM scan is finished, check if the problem is resolved. If you were unable to run SFC scan before, be sure to run it after DISM scan is finished and check if that solves your issue.

Epic guide alert! Everything you need to know about System File Checker is right here!

4. Replace the corrupted Rundll file

Sometimes this problem can occur if your Rundll32.exe file is corrupted. To fix the problem, it’s required that you copy Rundll32.exe from a working computer to your PC.

Simply find another Windows 10 PC, and go to C:WindowsSystem32 and look for the Rundll32.exe file. Copy that file to a USB flash drive.

replace rundll32.exe file

Now you just need to connect the flash drive to your PC and copy the Rundll32.exe to a C:WindowsSystem32 directory. Overwrite the file and restart your PC.

Once the PC restarts, the issue should be completely resolved. Keep in mind that overwriting system files can be potentially dangerous, so you’re replacing system files at your own risk.

4. Clear your browser’s cache and close all tabs

Several users reported Rundll32.exe error in their browser. If you’re having this problem, you most likely have a scamming website opened in one of your tabs.

If this problem occurs in your browser, try to clear your browsing history and cache. If that doesn’t work, be sure to close the tab that is giving you this message and everything should go back to normal.

You can also open a different browser and check if the issue reappears. If not, it means that you just have a scamming website open on the other browser.

Regardless of what the message in the browser says, your PC isn’t infected and your files aren’t corrupted, so there’s no need to worry. Simply close that tab and the issue won’t appear anymore.

Choose an easier way to clear your browser’s cache by installing a junk removing tool from this great list!

5. Make sure that your PC is up to date

Sometimes problems with Rundll32.exe can occur due to certain bugs on your system. However, you might be able to fix the problem simply by installing the latest updates.

By default, Windows 10 will install the missing updates automatically, but sometimes you might miss an important update.

However, you can always check for updates manually. This is rather simple and you can do that by following these steps:

  1. Press Windows Key + I to open the Settings app.
  2. Now navigate to the Update & Security section.
    Rundll32.exe error Windows 8
  3. Click on Check for updates button.
    Rundll32.exe error in pen drive

Windows will now check for available updates and download them automatically in the background.

After the updates are downloaded, they will be installed automatically as soon as you restart your PC. Once your PC is up to date, check if the problem still persists.

6. Perform a System Restore

If you’re frequently getting Rundll32.exe error on your PC, you might be able to fix the problem by performing a System Restore.

If you’re not familiar, System Restore is a useful feature that allows you to restore your PC to an earlier state and fix many problems. To use System Restore, you need to do the following:

  1. Press Windows Key + S and enter system restore. Choose Create a system restore point from the menu.
    Rundll32.exe virus
  2. Now click the System Restore button.
    Rundll32.exe application error
  3. System Restore window will now appear. Click Next to proceed.
    Rundll32.exe error entry point not found
  4. If available, check Show more restore points. Now select the desired restore point and click Next to proceed.
    Rundll32.exe runtime error
  5. Follow the instructions on the screen to complete the restoration process.

Once the restoration process is finished, check if the problem is resolved.

Check out our guide to learn everything there is to know about creating a System Restore Point in Windows 10!

If you’ve found other workarounds to fix this issue, you can share them with the community in the comments section below.

FAQ: Learn more about the Rundll32.exe error

  • Is Rundll32.exe error a virus?

No, it isn’t, although malware authors sometimes use these programs to hide malicious virus files they are trying to push onto PCs. That’s why you need protection from a great antivirus software tool.

  • What is Rundll32.exe used for?

Since there’s no way to directly launch DLL files, Rundll32.exe is a legitimate Windows file used to launch functionality stored in shared DLL files.

  • Can I end Rundll32.exe?

Rundll32.exe should never be uninstalled or disabled. If you do so, expect your system to become unstable at the very least.

Editor’s Note: This post was originally published in May 2018 and has been since revamped and updated in March 2020 for freshness, accuracy, and comprehensiveness.

Editor's Note: This article was originally published in July 2016 and was revamped and updated in November 2020 for freshness, accuracy, and comprehensiveness.
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