Fix Valorant Critical Error Guide

Valorant, Riot Games’ premier tactical shooter, delivers intense 5v5 matches packed with strategic depth and fluid gunplay. However, many players encounter the dreaded ‘A Critical Error Has Occurred’ message, which abruptly terminates the game or prevents launch. This issue often stems from conflicts with the Vanguard anti-cheat system, outdated system components, or permission glitches on Windows PCs. Whether you’re on Windows 10 or 11, this comprehensive guide provides step-by-step solutions to diagnose and eliminate the error, ensuring uninterrupted sessions. We’ll explore everything from basic restarts to advanced BIOS updates, empowering you to reclaim your competitive edge.

Understanding the Critical Error Phenomenon

The ‘critical error’ in Valorant typically appears during launch or mid-game, displaying a message like ‘A Critical Error Has Occurred’ followed by a process termination notice. This isn’t random; it’s frequently triggered by Vanguard, Riot’s kernel-level anti-cheat software, which enforces strict security to maintain fair play. Common culprits include service interruptions, incompatible drivers, pending OS updates, or hardware configuration mismatches like TPM or Secure Boot settings on newer Windows versions.

Players report this error across various setups, from high-end gaming rigs to laptops, often after patches, driver installs, or system restarts. Ignoring it leads to repeated crashes, lost progress, and frustration in ranked queues. Proactive troubleshooting restores stability, and most fixes take under 30 minutes. Always start with simple steps before escalating to reinstalls or firmware changes.

Initial Quick Fixes to Try First

Before diving deep, test these low-effort solutions that resolve the error in 70% of cases:

• Full System Restart: Close all apps, reboot your PC, and relaunch Valorant. This clears temporary RAM caches and resets conflicting processes.
• End Riot Processes: Open Task Manager (Ctrl + Shift + Esc), navigate to the Processes tab, and terminate any ‘VALORANT.exe’, ‘RiotClient.exe’, or ‘vgc.exe’ instances. Relaunch via the Riot Client.
• Internet Stability Check: Ensure a stable connection; Vanguard requires online validation. Restart your router if needed.

These steps reboot ancillary services without altering files, making them ideal starters.

Granting Administrator Privileges to Valorant

Windows User Account Control (UAC) can block Valorant and Vanguard from accessing necessary system resources, triggering the critical error. Elevating privileges fixes this reliably.

1. Locate the Riot Client shortcut on your desktop or Start menu.
2. Right-click it and select ‘Properties’.
3. Switch to the ‘Compatibility’ tab.
4. Under Settings, check ‘Run this program as an administrator’.
5. Click ‘Apply’ then ‘OK’.
6. Repeat for the Valorant executable: Right-click Riot Client, ‘Open file location’, then apply the same to VALORANT.exe in Riot Games folder (typically C:\Riot Games\VALORANT\live).

Restart your PC post-changes. This ensures Vanguard operates at kernel level without permission denials, preventing crashes on launch.

Optimizing Windows Updates for Compatibility

Outdated Windows builds often clash with Vanguard’s requirements, especially post-security patches. Keeping your OS current is crucial.

1. Press Windows + I to open Settings.
2. Go to ‘Windows Update’.
3. Click ‘Check for updates’ and install all available ones, including optional driver updates.
4. Restart as prompted.

For Windows 11 users, verify TPM 2.0 and Secure Boot are enabled in UEFI settings (more on this later). Recent updates like KB5034123 (2024) have improved Valorant stability by enhancing kernel security.

Configuring Vanguard Anti-Cheat Services Properly

Vanguard’s ‘vgc’ service must run automatically for Valorant to initialize. Misconfigurations halt it, causing errors.

1. Press Windows + R, type ‘services.msc’, and hit Enter.
2. Scroll to ‘vgc’ (Riot Vanguard).
3. Right-click, select ‘Properties’.
4. Set ‘Startup type’ to ‘Automatic’ or ‘Automatic (Delayed Start)’.
5. If stopped, click ‘Start’.
6. Apply changes and reboot.

This guarantees Vanguard loads on boot, interfacing seamlessly with Valorant’s executable.

Repairing and Verifying Game Files

Corrupted installations from interrupted downloads or disk errors can manifest as critical failures. Riot’s built-in repair tool restores integrity.

1. Open Riot Client.
2. Click the profile icon (top right) > Settings.
3. Scroll to ‘Valorant’ section.
4. Select ‘Repair’ under Game Installation.

Initiate the scan; it replaces damaged files without a full reinstall. Combine with clearing shader cache: Navigate to %LOCALAPPDATA%\Riot Games\VALORANT\Saved, delete contents, then relaunch.

Addressing TPM and Secure Boot on Windows 11

Windows 11 mandates TPM 2.0 and Secure Boot for Vanguard compatibility. Disabled settings trigger errors.

1. Restart and enter BIOS/UEFI (usually Del, F2, or F10 during boot).
2. Navigate to ‘Boot’ or ‘Security’ tab.
3. Enable ‘TPM 2.0’ (or fTPM on AMD systems; avoid discrete TPM if listed).
4. Enable ‘Secure Boot’.
5. Save and exit (F10 + Enter).

Post-reboot, run msinfo32 (Windows + R) and confirm TPM 2.0 as ‘Ready’. This resolves hardware attestation failures.

Disabling Full-Screen Optimizations

Windows’ full-screen optimizations can interfere with Valorant’s rendering pipeline.

1. Right-click VALORANT.exe (C:\Riot Games\VALORANT\live\ShooterGame\Binaries\Win64).
2. Properties > Compatibility tab.
3. Check ‘Disable fullscreen optimizations’.
4. Apply and launch.

This bypasses DWM conflicts, stabilizing frame delivery.

Updating Graphics Drivers and BIOS Firmware

Outdated GPU drivers or BIOS cause detection issues with Vanguard.

• Drivers: Use NVIDIA GeForce Experience, AMD Software, or Intel Arc Control for clean installs. Avoid third-party tools.
• BIOS: Visit your motherboard manufacturer’s site (e.g., ASUS, MSI), download the latest version, and flash via USB following their guide. Caution: Incorrect updates risk bricking hardware.

Post-update, test in a custom game.

Complete Reinstallation as Last Resort

If all fails, purge and reinstall:

1. Uninstall Valorant via Riot Client.
2. Run Riot Vanguard uninstaller (C:\Program Files\Riot Vanguard\vgc.exe /uninstall).
3. Delete residual folders: %PROGRAMDATA%\Riot, %LOCALAPPDATA%\Riot.
4. Reinstall from playvalorant.com.

Redownload ensures pristine files.

Preventive Measures for Long-Term Stability

Avoid future errors:

• Enable auto-updates in Riot Client.
• Schedule weekly Windows updates.
• Use antivirus exclusions for Riot folders.
• Monitor temps with HWMonitor to rule out overheating.

Frequently Asked Questions

Why does Vanguard cause critical errors?

Vanguard’s kernel-mode operation conflicts with restrictive security software or misconfigured services.

Is this error related to hardware?

Occasionally; check RAM with MemTest86 if persistent post-fixes.

Can I play without Vanguard?

No, it’s mandatory for online matches.

Does VPN fix it?

Rarely; disable VPNs as they interfere with authentication.