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How to Fix ‘Invalid MS-DOS Function’ error in Windows

Learn how to fix the 'Invalid MS-DOS Function' error in Windows.

In Windows 10, here’s How to Fix ‘Invalid MS-DOS Function’ error in Windows: If you have ever tried to move, copy, delete, or rename a file or folder and received the error message “Invalid MS-DOS function,” then you have come to the right place. Today, we are going to discuss how to fix the problem, so keep reading if this describes your situation.

Even if you try to delete some old pictures, there is a good chance that you will be met with the same error message. The error prevents you from copying files from one folder to another. Given that the files in question do not have a read-only attribute or are hidden, and that their security settings are the same as before, the issue is quite mysterious even on its own for regular Windows users.

Sometimes it is possible that the file is corrupted completely, which is why the error is displayed; however, this is not always the case. If you try to copy files from an NTFS file system to a FAT 32 file system, you will encounter the same error, and in that case, you will need to follow the instructions in this article. If none of the preceding statements apply to you, then you can fix the “Invalid MS-DOS function” error that occurs in Windows 10 by following the steps in the guide that is provided below.

What Does Invalid MS-DOS Function Mean?

When you change the location of a file on your computer, delete a file, copy a file, or rename a file, you might get an error that says “Invalid MS-DOS Function.” The error can be seen in the following: This is actually an error in the file system, which typically only affects the functionality of the file itself. Because of this issue, you won’t be able to operate the file as you normally would, which can be very annoying. In addition, it is possible for it to occur on any version of Windows, including Windows 10, Windows 8.1/8, and Windows 7.

How to Fix 'Invalid MS-DOS Function' error in Windows

Fortunately, it is possible to correct this mistake that was made. In the following sections, we will examine a number of strategies that have been demonstrated to be successful. You can solve this invalid MS-DOS function in Windows 10 by implementing one of these fixes, all of them, or a combination of them. The steps are essentially the same whether you are using Windows 8.1, 8, or 7.

How to Fix ‘Invalid MS-DOS Function’ error in Windows

Update your drivers

  1. Right-click on Start and choose Device Manager.
  2. Open up the section called Display Adapters.
  3. Select Update Driver when you right-click on your graphics card.
  4. Select Look for drivers automatically, and then wait.
  5. When you’re finished, restart your computer.

Use Safe Mode

  1. Turn your computer back on.
  2. Before you see the Windows logo, press F8, F10, Del, or another key (depending on who made your motherboard or laptop) over and over again.
  3. Windows will start up in Advanced Startup mode by itself.
  4. Choose Troubleshoot > Advanced > Startup Settings, and then click Restart.
  5. Choose 4/F4 for Safe Mode or 5/F5 for Safe Mode with Networking after a restart.

Transfer the file

  1. Make a new folder wherever you want, such as on your desktop.
  2. Drag the file that’s giving you trouble into the new folder.
  3. Try the action inside of this folder. If you are successful, you can then move the file back to where it was.

Tweak Windows Registry keys

  1. Press the Windows button + R to open the Run dialog. Then press the Enter key on your keyboard.
  2. Follow the directions:
  3. HKEY_LOCAL_MACHINESOFTWAREPoliciesMicrosoftWindows is the path.The system
  4. Right-click on a blank spot on the right and choose New.
  5. Click on the box that says DWORD (32-bit Value).
  6. Change the name of the value to CopyFileBufferedSynchronousIo.
  7. Next, open the value by doubleclicking on it.
  8. Enter 1 in the Value data box and press Enter to save the changes you just made.
  9. Lastly, restart your PC and check to see if the problem is gone.

Optimize And Defrag Your Storage Device

  1. Use the keyboard shortcut Win + E to open File Explorer.
  2. Use the built-in tool to go to the drive you want to defrag.
  3. To open the context menu, right-click on any empty space.
  4. Click on Properties on the new menu that appears.
  5. Change the tab to the Tools tab.
  6. Click on the Optimize button under “Optimize and defragment drive.”
  7. In the next window, choose your drive and click the Analyze button.
  8. Once that is done, click Optimize to make the storage device less cluttered.


How to repair disk using cmd?

Type cmd into the search box on your desktop and click Run as administrator to open the Command Prompt. Type chkdsk C: /f into the command line. If you’re trying to fix a drive that isn’t the C drive, change “C” to the letter of the drive you want to fix.

Can you recover a corrupted drive?

There is a chance that you can get your data back even if your hard drive is broken in a logical way. If your drive has crashed or is broken, you might not be able to get to your data. On both Windows and Mac, you can use the Disk Management tool to fix this problem and get to this data.20-Oct-2022

Michael Smith
Michael Smith
Michael Smith, a tech-savvy content editor at Bollyinside. With a knack for simplifying complex tech concepts, Michael specializes in crafting user-friendly "How-to" articles and valuable tips. His focus spans Windows, Mac, hardware, and support. Beyond work, he's an avid explorer of diverse tech fields, constantly staying ahead of the curve.
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