In this post, we will help you fix Ucrtbase.dll was not found or missing error on Windows PC. If this DLL file is removed from your system or gets corrupted, then it may prevent some applications or programs that use this file from running. And when you try to run such a program, you may see the following error:

This application failed to start because ucrtbase.dll was not found. Re-installing the application may fix this problem.

What is the Ucrtbase.dll file?

Ucrtbase.dll is a system file and it is stored under the C:\Windows\System32 folder and/or C:\Windows\SysWOW64 folder. It is a Microsoft C Runtime Library file and has a file size of around 1.08 MB. Certain programs or games need this Dynamic Link Library file to run properly in the absence of which users may face an error message depending upon the program they want to run. If you have this problem, the solutions covered in this post will help you fix it.

Fix Ucrtbase.dll was not found or missing error on Windows PC

You can use the following solutions to fix Ucrtbase.dll was not found or missing error on your Windows PC:

1. Run the System File Checker tool
2. Re-register the ucrtbase.dll file
3. Place the ucrtbase.dll file in the installation location of the affected program
4. Re-install the affected program
5. Repair Microsoft Visual C++ Redistributable package(s).

Let’s check these solutions one by one.

1] Run the System File Checker tool

This solution has helped some users and it might work for you as well. If there is some problem with the ucrtbase.dll file itself, then use the System File Checker tool (a built-in command line utility for repairing the corrupt system files including DLLs) to repair it. Open an elevated Command Prompt window and execute the following command:

sfc /scannow

The tool will check for the issue and replace the ucrtbase.dll file with a cached copy or repair it.

2] Re-register ucrtbase.dll file

If the above solution doesn’t work, then you should re-register the ucrtbase.dll file using the Regsvr32 tool. It is also a built-in command-line tool for Windows 11/10 to unregister, register, or re-register DLL files that you can use if you face some error related to a particular DLL file while opening a program. In this case, to re-register the ucrtbase.dll file, open the Command Prompt window as an administrator, and use the following command:

Regsvr32 ucrtbase.dll

If the command is executed successfully, then restart your Windows 11/10 system, and open the program for which you get the error message. Your problem should be gone now.

If the command doesn’t execute successfully and you receive a DllRegisterServer was not found error, then first adjust permissions for the TypeLib Registry key, temporarily disable your third-party antivirus tool, and then execute the command again.

3] Place the ucrtbase.dll file in the installation location of the affected program

As mentioned above, there are different programs and games that require this file to run properly. So, if the ucrtbase.dll file is not found in the installation directory of that game or program, then you may get this error. So, one solution to fix this issue is to place the ucrtbase.dll file in the installation location of the affected program. Access the System32 or SysWOW64 folder on your Windows PC and copy the ucrtbase.dll file. Go to the directory where your program is installed and paste the DLL file there and re-register it. Now try to run the program. It should work.

4] Re-install the affected program

It could be possible that the problem is actually with the affected program only. Corrupt installation might be the cause of it. So, in this case, completely uninstall the affected program (remove its leftovers, Registry entries, etc.) and then re-install that program. It should solve this ucrtbase.dll was not found error.

Related: How to fix Kernel32.dll not found errors

5] Repair Microsoft Visual C++ Redistributable package(s)

If you receive ucrtbase.dll was not found error for the Microsoft Visual Studio program or some other program that uses the Microsoft Visual C++ Redistributable package, then it could have happened because the Microsoft Visual C++ Redistributable package(s) installed on your system is corrupted. In that case, you need to repair the installed Microsoft Visual C++ Redistributable packages one by one. For this:

• Open the Control Panel
• Access the Programs category
• Select Programs and Features
• Select a Microsoft Visual C++ Redistributable package
• Press the Change button for that package available on the top part of the Control Panel. It will open a separate box
• Press the Repair button in that box.

Repeat this process to repair the other installed packages one by one.

After completing the repair process, restart your system, and open Microsoft Visual Studio or another program. The problem should be fixed.

How do I fix RunDLL files in Windows 11/10?

If you receive a RunDLL error and it stops you from accessing files stored on your USB drive after connecting it to your Windows 11/10 computer, then you should perform an antivirus scan for your PC and USB drive. Also, remove junk and temporary items from your system, look for dead startup entries, and delete them to fix this problem.

Read next: How to fix Missing DLL files errors on Windows PC.