Technical Guide to Fix Runtime Error R6016 - Pure Virtual Function Call on Windows 10/8/7

Understanding Error R6016

Most Windows applications are built using Microsoft development tools and rely on shared Visual C++ Redistributable files to function. When these files are missing or corrupted, errors like R6016 occur.

When this error appears:

• During application launch
• On game loading screens
• After Windows or software updates
• Randomly on previously working applications

Common error message formats:

• "Microsoft Visual C++ Runtime Library - Runtime Error! R6016 - pure virtual function call"
• "Runtime Error! Program: C:\...\application.exe R6016"
• Silent crash without error message

Primary causes:

• Missing Visual C++ files (most common)
• Corrupted runtime libraries
• Version mismatches (application requires specific version)
• Actual software bugs (less common)
• Windows Update side effects

Fix #1: Reinstall Visual C++ Redistributables

This resolves approximately 70% of R6016 errors. Complete removal and clean reinstallation of Visual C++ runtime files takes about 10 minutes.

1. Check for application updates:
   • Before modifying system files, verify if the software developer released a fix
   • Check application website or built-in update feature
   • Install updates and test before proceeding
2. Check installed Visual C++ versions:
   • Open Settings (Windows key + I)
   • Navigate to Apps
   • Search for "Visual C++"
   • Note all installed versions (years: 2013, 2015, 2019, etc.)
3. Uninstall all Visual C++ packages:
   • Select each Microsoft Visual C++ Redistributable entry
   • Click Uninstall
   • Remove all entries
   • Restart computer
4. Download fresh packages from Microsoft:
   • Search "Visual C++ Redistributable download"
   • Access official Microsoft download page
   • Download required versions:
     • Visual C++ 2015-2022 x64
     • Visual C++ 2015-2022 x86
     • Visual C++ 2013 x64 and x86 (for older applications)
   • Important: Download both x64 and x86 versions (many programs use 32-bit components)
5. Install packages:
   • Right-click each downloaded file
   • Select "Run as administrator"
   • Install 2013 versions first, then 2015-2022
   • Install x64 before x86 for each version
   • Allow each installation to complete
   • Select "Repair" if prompted
6. Restart and test:
   • Restart computer
   • Test application

Fix #2: Enable Compatibility Mode

When the issue isn't file corruption, compatibility problems between the application and Windows may be the cause. Compatibility mode acts as a bridge between older applications and newer Windows versions.

1. Locate application executable:
   • Navigate to installation directory (typically C:\Program Files or Program Files (x86))
   • Find the .exe file with the program icon
   • Use the actual program file, not desktop shortcut
2. Access compatibility settings:
   • Right-click .exe file
   • Select Properties
   • Click Compatibility tab
3. Configure settings:
   • Check "Run this program in compatibility mode for:"
   • Select Windows 7 (most permissive option)
   • Check "Run this program as an administrator"
   • Click Apply, then OK
4. Test application:
   • Launch program
   • Confirm UAC prompt
   • If unsuccessful, try Windows 8 compatibility mode

Note: If Windows 7 compatibility mode fails, test Windows 8 and Windows Vista modes sequentially.

Fix #3: Repair System Files

Corrupted Windows system files can cause R6016 errors. Windows updates, malware, or hard drive errors can corrupt files. Use built-in repair tools to resolve.

1. Open Command Prompt as administrator:
   • Click Start, type "cmd"
   • Right-click Command Prompt
   • Select "Run as administrator"
   • Confirm UAC prompt
2. Run System File Checker:
   • Type: sfc /scannow
   • Press Enter
   • Wait 20-30 minutes (do not interrupt)
   • Do not close window during scan
3. If SFC reports unfixable issues, use DISM:
   • After SFC completes, type: DISM /Online /Cleanup-Image /RestoreHealth
   • Press Enter
   • Wait 20-40 minutes (requires internet connection)
   • Do not interrupt process
4. Run SFC again:
   • Execute sfc /scannow again
   • Verify all issues resolved
5. Complete repair:
   • Restart computer
   • Reinstall Visual C++ files from Fix #1
   • Test application

Technical details: SFC scans all Windows system files and replaces corrupted ones. DISM repairs the component store that SFC uses as reference. Combined, these tools resolve most system file corruption issues.

Fix #4: Clean Application Reinstall

If previous fixes fail, the application installation may be corrupted. Complete removal and fresh installation often resolves persistent R6016 errors.

1. Uninstall application:
   • Open Settings → Apps
   • Locate problematic application
   • Click Uninstall
   • Complete uninstall wizard
2. Remove residual files:
   • Navigate to C:\Program Files\ or C:\Program Files (x86)\
   • Delete application folder if present
   • Press Windows key + R, type %appdata%
   • Delete folders matching application name
   • Repeat for %localappdata%
3. Clean temporary files:
   • Press Windows key + R, type %temp%
   • Select all (Ctrl+A), delete
   • Skip locked files in use
   • Empty Recycle Bin
4. Restart system:
   • Restart computer
   • Clears locked files and settings
5. Fresh installation:
   • Download latest version from official website
   • Avoid third-party download sites
   • Right-click installer, select "Run as administrator"
   • Install to default location

Quick Troubleshooting Checklist

Additional checks before concluding the issue is unresolvable:

• Windows updates: Navigate to Settings → Windows Update and install pending updates
• Antivirus interference: Temporarily disable antivirus and test. If resolved, add application exception
• System resources: Verify adequate RAM and disk space. Close unnecessary programs
• Widespread issue check: Search "[application name] R6016 error" to find known fixes or workarounds

Prevention

Prevent future R6016 errors:

• Avoid uninstalling Visual C++ Redistributables without understanding dependencies
• Keep applications updated (developers fix bugs in patches)
• Maintain Windows updates (includes runtime library updates)
• Avoid aggressive system "optimization" tools that may remove critical files
• Create system restore points before installing new software

Frequently Asked Questions

Is this error user-caused?

No. R6016 is almost never caused by user actions. It results from either programming bugs in the application or corrupted system files occurring through normal system operation.

Can R6016 damage the computer?

No. R6016 only prevents application execution. It does not damage hardware, corrupt files, or cause lasting system problems.

Why does this affect some users but not others?

System configurations vary in installed Visual C++ versions, Windows versions, and component update status. These differences cause inconsistent error occurrence across users.

Can missing DLL files be downloaded individually?

Do not download DLL files from third-party websites. These sites often distribute malware. Always use official Microsoft redistributable installers - they're free, safe, and properly resolve the issue.

Multiple programs show R6016 after fixing one

This indicates system-wide Visual C++ issues. Execute Fix #3 (System File Repair) thoroughly, then reinstall all Visual C++ redistributables fresh.