How to Fix UCRTBASE.dll Missing Error

UCRTBASE.dll is the Universal C Runtime (UCRT) base library, a core Windows component.

Purpose: - Provides standard C library functions - Used by programs compiled with Visual Studio 2015 and later - Part of Windows 10/11

On Windows 10/11: UCRTBASE.dll is a system file included with Windows.

On Windows 7/8.1: UCRTBASE.dll was provided via Windows Update (KB2999226) or the Visual C++ Redistributable.

The UCRT is included with Visual C++ 2015-2022:

Download Links: - Visual C++ 2015-2022 x64 - Visual C++ 2015-2022 x86

Steps: 1. Download both x64 and x86 versions 2. Run x64 installer first 3. Run x86 installer 4. Restart your computer

This should install or repair UCRTBASE.dll.

On older Windows versions, UCRT is provided via Windows Update:

Step 1: Open Windows Update

Step 2: Check for updates

Step 3: Install all available updates, especially KB2999226 (Universal C Runtime)

Manual Download: If Windows Update doesn't work, download KB2999226 directly: 1. Go to Microsoft Update Catalog (catalog.update.microsoft.com) 2. Search for KB2999226 3. Download the version for your Windows

Prerequisites: KB2999226 requires KB2919355 (Windows 8.1 Update) on Windows 8.1.

On Windows 10/11, UCRTBASE.dll is a protected system file:

Step 1: Open Command Prompt as Administrator

Step 2: Run SFC: `` sfc /scannow `

Step 3: If SFC finds issues, run DISM: ` DISM /Online /Cleanup-Image /RestoreHealth `

Step 4: Run SFC again: ` sfc /scannow ``

Step 5: Restart your computer

This will restore the correct UCRTBASE.dll from the Windows component store.