[Fixed!] Error 509 in Excel (4 Possible Solutions)

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Error 509 in Excel is also known as the runtime error(bug). Before releasing the final product to the public, Software developers generally work through different stages of debugging so that they can fix bugs. But they can miss many errors resulting in problems like those associated with Error 509. The error presents itself with a short error message “Error 509: Microsoft Excel has encountered a problem and needs to close. We are sorry for the inconvenience.”

Possible Reasons for Runtime Error 509 in Excel

The error message says that Excel is going through an internal problem. It can cause Excel to crash, fail to load or may result in data loss. The most common Excel Error 509 occurs while loading up Microsoft Excel. Let’s see some possible reasons for Error 509 in Excel.

Incompatible Background Programs: When a third-party program is running in the background, the program can conflict with the Excel operations and stop it from running properly causing the error code.

Virus or Malware Infection: Sometimes, a virus or malware can infect and corrupt the Excel file which causes the runtime Error 509.

Excel File Corruption: In case of a corrupted Excel file, Error 509 can occur.

MS Visual C++ Package Corruption: If the MS Visual C++ Package is not installed or gets corrupted, it can cause Error 509 in Excel.

[Fixed!] Error 509 in Excel: 4 Possible Solutions

Runtime Error 509 can occur when incompatible programs run at the same time. It may also occur because of memory problems or virus infection. Whatever the case may be, the problem must be addressed immediately to avoid further problems. So, let’s see how we can solve the problem.

1. Closing Background Application to Solve Error 509

You can solve Error 509 by disabling the background applications.

  • Press Ctrl+Alt+Del simultaneously to launch the Task Manager. You can see all the active programs here.
  • Then Go to the Processes tab, select the unnecessary programs in the background, and click the End Task button.

error 509 excel

After deleting the unnecessary background applications check if the error appears or not.

2. Scanning for Viruses

Virus or malware can cause Error 509. So, you can run an antivirus scan to solve this problem.

  • First, Go to the Windows Defender.
  • Then, from the Home tab, select Full from the Scan options.
  • After that, just select the Scan Now button.

  • Now, give your PC some time to scan.
  • Then, restart your PC and see if your problem is solved.

3. Reinstalling MS Visual C++

Sometimes, the MS Visual C++ may not be installed properly or may be corrupted. In that case, first, we have to uninstall the program and then reinstall the same program we can solve Error 509 in Excel.

  • First, go to the Control Panel.
  • Then, select the Programs and Features option.

  • Now, click right on the latest Microsoft Visual C++ Redistributable and select the Uninstall option.

error 509 excel

  • Give your PC some time to Uninstall.
  • Then, restart your PC.
  • After that, you have to download and Install the latest version of the Microsoft Visual C++ Redistributable.
  • Now, check whether the problem is solved or not.

4. Cleaning Disk Space

Lack of space in your computer can cause Error 509. You can free up some space from the computer to solve the issue.

  • First, make sure you have backed up the necessary data.
  • Then, click right on the C drive and select the properties option.
  • Doing so, this window will appear.
  • Now, select Disc Cleanup.

  • Give your PC some time for cleanup preparation.
  • Then, select the items you want to clean and press OK.

After cleanup, restart your PC and see whether the problem is solved or not.


Thank you for making it this far. We have discussed 4 possible reasons for Error 509 in Excel and have shown you how to solve this problem. We hope you find the content of this article useful. If there are more queries or suggestions feel free to mention them in the comment section.

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Sourav Kundu
Sourav Kundu

Sourav Kundu, BSc, Naval Architecture & Marine Engineering, Bangladesh University of Engineering and Technology, is a dedicated technical content creator of the ExcelDemy project. He has a keen interest in Excel and he leverages his problem-solving skills to provide solutions on user interface with Excel. In his position as an Excel & VBA Content Developer at ExcelDemy, Sourav Kundu not only adeptly addresses challenging issues but also demonstrates enthusiasm and expertise in navigating complex situations. Apart from creating... Read Full Bio

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