Hey there, let's get your RStudio up and running smoothly—since your R installation works perfectly fine, the issue is tied to RStudio's dependency on that missing Windows Runtime DLL. Here are step-by-step fixes to try, starting with the quickest and most reliable:

1. Repair Windows System Files #

The missing DLL is part of Windows' core runtime components, so scanning for corrupted system files often resolves this:

• Open Command Prompt as Administrator (right-click Start → select "Windows Terminal (Admin)" or "Command Prompt (Admin)").
• Run this command to scan and repair system files:

  sfc /scannow
  

• Wait for the scan to complete (it might take 10-15 minutes). If it finds and fixes issues, restart your PC and try launching RStudio again.
• If sfc doesn't resolve it, run this command to repair your system image first, then re-run sfc:

  DISM /Online /Cleanup-Image /RestoreHealth
  

2. Install the Microsoft Visual C++ Redistributable Package #

This DLL is included in the Visual C++ Runtime libraries, which RStudio relies on heavily:

• Download the Microsoft Visual C++ Redistributable for Visual Studio 2015-2019 (match your system architecture: x64 for 64-bit Windows, x86 for 32-bit).
• Run the installer, follow the prompts to complete installation, then restart your computer. Try opening RStudio again.

3. Perform a Clean Reinstall of RStudio #

A partial or corrupted RStudio installation might be the culprit—let's do a full reset:

• Uninstall RStudio via Control Panel → Programs and Features: Find RStudio in the list, right-click it, and select "Uninstall".
• Delete the leftover RStudio installation folder (default paths are C:\Program Files\RStudio for 64-bit, or C:\Program Files (x86)\RStudio for 32-bit).
• Download the latest compatible version of RStudio (make sure it matches your R version—e.g., R 4.x works with the latest RStudio builds).
• Right-click the installer and select "Run as administrator" to install it, then launch RStudio.

4. Install All Windows Updates #

Outdated system files can cause runtime library missing errors:

• Open Settings → Windows Update and install all available updates, including optional updates.
• After updates are installed, restart your PC and test RStudio again.

Bonus Tip for Windows 7 Users #

If you're on Windows 7, this DLL requires the KB2999226 update. Install this patch, restart your system, and try RStudio again.

内容的提问来源于stack exchange，提问作者Rojer