What to do when Userdata.dll is missing in Windows 10



Corrupt or outdated .dll files can cause a lot of trouble, but keeping your drivers up-to-date eliminates a lot of potential problems.


2. Scan the Registry With CCleaner

  1. Download CCleaner for free and wait for the setup to finish.
  2. Open CCleaner and click Registry on the left of CCleaner’s window to open the registry cleaner.Clean registry errors
  3. Select all the registry check boxes, and press the Scan for Issues button.
  4. Click the Fix selected Issues button.
  5. Next, select the Yes option if you prefer to save a backup file (although you probably won’t need it).
  6. Press the Fix All Selected Issues button to repair the registry.


With this simple and intuitive tool, anyone can efficiently repair registry errors.

3. Run a System File Checker scan

  1. Enter command prompt in the home screen search box.
  2. Right-click Command Prompt and select Run as administrator to open its window.
  3. Next, write the following command and press Enter: DISM.exe /Online /Cleanup-image /Restorehealth
  4. Then input sfc /scannow in the Prompt, and press the Enter key.
  5. Restart Windows if Windows Resource Protection does repair corrupted files.

If SFC scan isn’t enough, learn to use the DISM command.

4. Remove programs from the Windows Startup

Some users have said that they fixed the issue by removing the Password Manager Pro and Fingerprint Reader programs.

Thus, it might be the case that a startup program generates the error message. So removing software from the system startup is another potential fix for the userdata.dll error.

So this is how you can disable startup software in Windows 10.

  1. Pree Win + X and select Task Manager from the menu.fix audio buzzing
  2. Click the Start-up tab.
  3. Then you can remove programs from the Windows startup by selecting them and clicking Disable.

5. Roll back Windows with System Restore

System Restore can come in handy for fixing corrupted DLL files. With this utility, you can restore Windows 10 to an earlier point in time, which can fix corrupted system files.

in this case, you should select a restore point that will restore Windows to a date when the DLL error message did not pop up on your laptop or desktop.

This is how you can roll back Windows:

  1. Right-click the Start menu and select Run.
  2. Enter rstrui in Run’s Open text box and click OK to open the System Restore window.
  3. Click the Choose a different restore point option as an alternative to the recommended restore.
  4. Press the Next button to open the list of restore points.
  5. To view the full restore list, click the Show more restore points option.
  6. Choose a restore point to roll Windows back to.
  7. Restoring Windows removes programs installed after a selected restore point.
  8. You can press the Scan for affected programs button to see what software is deleted for a specific restore point.
  9. Click Next and Finish to roll back Windows.

6. Reinstall the software

If the userdata error message pops up for a specific program, reinstalling that software might fix the error.

The userdata.dll is missing error message states, Reinstalling the application may fix this problem. So that’s one hint for fixing the DLL error. This is how you can reinstall the program.

  1. Open Run as shown before.
  2. Input appwiz.cpl in the box and click OK.
  3. This will open Control Panel, where you have to select the program that returns the DLL error message, and click the Uninstall button.
  4. Click the Yes button to confirm.
  5. Restart Windows after uninstalling the program.
  6. Then reinstall the latest version of the software. You can usually download the latest version from the software’s website.

7. Get a new userdata.dll file

  1. Open the official DLL files webpage in your browser.
  2. Click Download to save the userdata.dll ZIP.
  3. Open the userdata ZIP in File Explorer.
  4. Press the Extract all button.
  5. Click Browse to select a folder path to extract the ZIP to, and click the Extract button.
  6. Open the extracted userdata.dll folder in File Explorer.
  7. Select the userdata.dll file, and press the Copy to button.
  8. Select to copy it to the System32 folder.
  9. Then select the original userdata.dll file in the folder you exacted it to, and press the Delete button.
  10. Restart your desktop or laptop.
  11. You might also need to register the DLL file. To do so, press the Windows key + X hotkey and select Command Prompt (Admin).
  12. Enter regsvr32 userdata.dll in the Command Prompt’s window, and press Enter.
  13. Click Restart on the Start menu.

8. Add DLL Fixer software to Windows

There are numerous DLL fixer software for Windows that fix DLL errors. DLL Suite, DLL Tool, DLL Files Fixer, and Free DLL Fixer are some of the utilities that scan for and repair corrupted DLL files.

They also include databases that you can get replacement DLL files from. As such, those utilities might come in handy for fixing the userdata.dll is missing error. You can try out an unregistered version of DLL Suite by clicking the Start Download button on this page.

So these are a few resolutions that should fix the userdata.dll is missing error in Windows 10.

Note that some of the above resolutions might also fix missing DLL error messages for other files.

Editor’s Note: This post was originally published in October 2018 and was revamped and updated in October 2020 for freshness, accuracy, and comprehensiveness.

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