vgk.sys error in Windows: Causes, solutions, and how to avoid it

Encountering the dreaded vgk.sys error in Windows has become a major headache for hundreds of users, especially those who enjoy popular games like Valorant or League of Legends . This error usually appears as a blue screen of death (BSOD), causing confusion, fear of data loss, and even difficulty restarting the computer. Unfortunately, it's not a simple one-off error; it often reappears and can require significant technical intervention to resolve.

If you've encountered, or fear encountering, this error and don't know where to begin to fix it, here's a detailed explanation of all the causes, implications, and solutions so you can get back to gaming—or working—with complete peace of mind. From what vgk.sys actually is and why it causes conflicts to step-by-step instructions for each motherboard or component, including recommendations to prevent future issues. Get comfortable because here's the definitive guide in Spanish on the Windows vgk.sys error.

What is the vgk.sys file and why does it cause errors?

The vgk.sys file belongs to Riot Games' Vanguard anti-cheat system , primarily used in Valorant and also adapted for League of Legends. This component is installed at the Windows kernel level, meaning it's in the most critical and sensitive part of the operating system. Therefore, any conflict with this file can result in serious stability errors , typically with codes such as SYSTEM THREAD EXCEPTION NOT HANDLED , KMODE EXCEPTION NOT HANDLED , or CRITICAL PROCESS DIED.

The most common symptoms include recurring crashes, unexpected restarts, the inability to boot Windows, or, in the worst cases, an endless loop of blue screens that forces you to take drastic measures. Sometimes, the system seems to restart successfully, but the error reappears every time you run a game related to Riot Vanguard.

Common causes of vgk.sys errors

The vgk.sys error does not always have a clear origin and can be due to several causes, often combined:

• Vanguard Service Failure: If the anti-cheat does not start correctly or conflicts with other drivers, it generates critical errors.
• Old or incompatible drivers: An outdated graphics driver, chipset, or any component can be a trigger.
• Corrupt files: Both game and system issues, especially if there have been forced closures or failed updates.
• Recent firmware/BIOS updates: Latest generation Intel CPUs have shown incompatibilities with certain older BIOS versions.
• Advanced settings in the BIOS: Overclocking, poorly adjusted power limits or experimental profiles tend to be sources of conflicts.
• Virtualization: Advanced features such as Virtualization-based Security may interfere with the management of drivers and services.
• Malware or system corruption: If there are serious infections or failures, vgk.sys may stop working properly.

It's worth noting that Vanguard is a very intrusive anti-cheat system: it runs when Windows starts and monitors the system at the highest level, so any "anomalous" modification to the environment can trigger alarms... and crash your PC.

Getting Started: Safe Diagnosis for the vgk.sys Error

Before you start messing around, it's a good idea to determine whether the error is sporadic or persistent. If it's only happened once, you can try restarting and updating your system. But if it's recurring, it's best to start with safe methods:

• Reboot in safe mode: If Windows does not boot normally, force shutdown three times during boot to enter the boot environment. advanced recovery and choose Safe Mode to be able to intervene.
• Update the system: The first thing is always to have Windows Update installed up to date, along with the official drivers from the PC and graphics card manufacturer.
• Make a backup: If you can boot your system, take advantage of the opportunity to save your important files before making any drastic changes.

Top solutions to vgk.sys error

1. Check and update BIOS/Firmware (especially Intel 13th and 14th generation CPUs)

If you have a 13th or 14th generation Intel processor , many manufacturers have released critical updates to address the Vanguard compatibility issue. It is essential that you:

• Make sure you have installed the latest BIOS version for your motherboard.
• After updating, enter the BIOS and activate the recommended settings for your motherboard:
  • MSI: Choose Intel Default Settings.
  • ASUS: Choose Intel Baseline Profile.
  • Gigabyte: Active Intel BaseLine.

With this simple action, in most cases, the problem disappears.

2. Advanced BIOS Settings: Overclocking and Power Limits

Overclocking settings and voltage and power limits may be contributing to the problem. Open the BIOS and look for:

• Disable any option «Enhanced» (improved turbo, multi-core, performance enhancement).
• Check the power limits and configure them as Intel recommends (e.g. 125W for long limit, 253W for short on 13900/14900 CPUs).
• If you have the option to performance core multiplier, reduce it from 55x to values ​​of 54x or 53x.
• Deactivate thermal velocity boost or any automatic frequency increase depending on temperature.

If you're not sure how to identify these options, consult your motherboard documentation or contact technical support.

3. Repair or reinstall Vanguard and Riot games

In many cases, reinstalling Vanguard resolves corrupted file conflicts:

• From Control Panel > Programs > Uninstall a program, remove Riot Vanguard and if necessary Valorant y Riot Customer.
• Restart your computer.
• Reinstall the game from the official Riot Games website. Vanguard will install automatically.

In some cases, Vanguard may not start correctly. Check in Windows Services that the vgc service is set to "Automatic" and is running.

4. Repair files from the Riot client

If only the game is corrupted, you can try the Repair function from within the Riot client itself:

• Open the Riot Client and log in.
• Sign in Configuration and select the affected game (Valorant or LoL).
• Balance Repair and wait for it to finish.

5. Disable Windows Fast Startup

Fast Startup speeds up Windows startup, but it can prevent services like Vanguard from starting correctly. To disable it:

• Balance Windows + R, writes powercfg.cpl and hit Enter.
• Click on Choose the behavior of the on / off buttons.
• Click on Change currently unavailable settings.
• Uncheck Activate fast startup and save the changes.

Restart your PC and check if the problem disappears.

6. Disable virtualization-based security

Features such as Hyper-V, Microsoft Defender Application Guard, or Virtual Machine Platform may conflict with Vanguard. To disable them:

• Search Enable or disable Windows features in the start menu.
• Uncheck Hyper-V, Virtual Machine Platform and the like.
• Enter the BIOS and disable the option Virtualization tab Advanced.

Remember that some computers use different names for these options.

7. Reset Windows

As a last resort, if nothing else has worked, you can reset the operating system while keeping your personal files, if you wish. Here's how:

• Sign in Settings > Update & security > Recovery.
• Low Reset this PC, Click on Contac us.
• Choose whether you want to keep your files or delete everything, and follow the wizard.

Remember that you'll need to reinstall all your programs afterward and make a backup just in case.

Specific solutions for motherboards (MSI, ASUS and Gigabyte)

Depending on your motherboard model, there are advanced solutions recommended directly by Riot Games to stabilize your system:

ASUS

1. Access the BIOS.
2. Select the tab ADVANCED (F7) > SVID Behavior.
3. Change to Intel's Fail Safe.
4. Save changes and reboot.

Gigabyte

Option A:

1. Enter BIOS, advanced mode.
2. In the Tweaker, search CPU Vcore and change to Normal.
3. Adjusts Dynamic Vcore (DVID) from "Auto" to + 0.005V. Increase if necessary in steps of +0.005V.
4. Reboot to check stability.

Option B:

1. En Advanced Voltage Settings, go into CPU/VRAM Settings.
2. Adjusts CPU Vcore Loadline Calibration, starts at Low and goes up to Medium if necessary.
3. Restart the system.

MSI

Option A:

1. In BIOS, go to OC > Advanced CPU Configuration.
2. Change CPU Lite Load Control a Intel Default.
3. Save and restart.

Option B:

1. En OC > CPU Core Voltage Mode, Select Offset Mode.
2. It increases in values ​​up to +0.025V progressively.

Option C:

1. En OC > DigitalALL Power, adjust CPU Loadline Calibration Control; starts in Mode 7 and goes down until it stabilizes.

Other additional techniques and tips

• Full permissions for vgk.sys: Sometimes the vgk.sys file doesn't have the proper permissions. You can fix this from C:\Program Files\Riot Vanguard, vgk.sys properties > Security > Edit > Give full control to all users.
• Remove remnants of the Riot client: After uninstalling, delete the folder C:\Users\YourUser\AppData\Local\Riot Games and empty the trash.
• Check disk partition: If your Windows is in MBR format and you are using Windows 11, consider converting the disk to GPT for full compatibility.
• Data recovery solutionsIf you lost files, tools like Stellar or EaseUS Data Recovery can help you recover them after a BSOD.

What if the vgk.sys error persists after trying everything?

If you continue to experience the error after following these steps, you may have a very specific conflict or incompatibility that Riot Games has not yet resolved. Don't hesitate to contact official support by sending logs, details of your hardware, and the steps you've already tried. The more information you provide, the faster they can assist you.

The vgk.sys error may seem like an unsolvable problem, but with patience and by following this thorough method, most users manage to restore stability to their system and continue enjoying their favorite games without interruption. Always remember to keep your system and drivers updated , avoid making risky changes to the BIOS without knowing the impact, and if in doubt, consult official sources or specialized communities to avoid further risks. Your gaming experience—and the security of your computer—depend on it.