League of Legends crashing, black screen or won’t launch on Windows 11? Riot’s official fixes: Failed to launch, restart loop, clean boot, laptop GPU

League of Legends on PC can crash to the desktop, freeze, stay on a black screen, refuse to start with an error, or keep asking you to restart your computer because of Riot Vanguard. Riot Games Support has a separate guide for each of these cases. Here are the steps in Riot’s own order, read on November 11, 2026. Several of these pages are Riot-wide guides that apply to all Riot games on PC, League included. TricknFix did not test these steps; if you change BIOS/UEFI settings, follow your PC or motherboard manufacturer’s documentation.

First: does an error code appear?

• If a specific error code or message appears, Riot asks you to search for that exact error on its support site first: a dedicated guide has a better chance of fixing it.

• Errors starting with VAN come from Riot Vanguard and have their own list: Riot’s “Vanguard Error Codes” page (link in the sources).

Crash to desktop, freeze or black screen with no error code

Riot’s “Troubleshoot PC Game Crashes” guide (updated October 28, 2025) says to try these steps in order and launch the game after each one:

• 1) Check the game’s minimum system requirements. 2) Restart the PC. 3) Update your graphics card drivers. 4) Install all Windows updates and restart if asked. 5) Perform a clean boot. 6) Reset your graphics software (NVIDIA Control Panel or AMD Software: Adrenalin Edition) to its defaults. 7) Lower your video settings, starting from the lowest values. 8) Do a clean reinstall of the game.

• Still crashing: submit a ticket to Riot Player Support and attach your logs.

• League-specific tip from Riot’s “Fix My League” guide (May 18, 2026): Low Spec Mode sets all variable graphics options to low. Open the League client, click the gear icon, and in the General tab tick “Enable Low Spec Mode” at the top. It cannot be turned on while in a game.

• The same guide says overlay software (Discord, OBS and Steam are its examples) can make League crash: close those apps and test with a custom game.

• Note: the system requirements table on that page is labelled “Accurate as of April 2023” and only lists Windows 7, 8 and 10; it also shows the Windows 10 update path (Updates & Security). On Windows 11, updates are under Settings > Windows Update.

Clean boot, as described by Riot

• Press Windows + R, type msconfig, open the Services tab and tick “Hide all Microsoft services” so you do not disable a key process, then click Disable all.

• If you also play VALORANT, Riot says to find the “vgc” service and tick it again: it is required for VALORANT.

• Then disable startup programs, apply, and restart the PC. Riot links Microsoft’s own clean boot article for the most precise instructions.

Stuck on a black, loading or lobby screen

• Riot’s “Fix My League” list: 1) close League and run it as an administrator (right-click the game shortcut > Properties > Compatibility > tick “Run this program as an administrator” > Apply > OK), 2) update Windows, 3) clean boot, 4) reinstall League of Legends.

• Clean reinstall according to Riot: uninstall League of Legends from Settings > Apps, delete the Riot Games folder (default C:\Riot Games), type %localappdata% in File Explorer’s address bar and delete the Riot Games folder there (or only its League of Legends folder if you have other Riot games), restart, download League again and run the installer as an administrator.

• Riot notes that the Riot Repair Tool can re-patch and reinstall League automatically.

“System Error” or “Critical Error” at launch

Riot’s “Troubleshooting Game Launching Errors” guide (May 19, 2026):

• Clear the cache: open C:\Users\<you>\AppData\Local, delete the game folder, then open the Riot Games folder and delete any game folder there.

• Perform a clean boot, add firewall exceptions for the game and the Riot Client (Riot’s Connection Troubleshooting Guide for PC), and temporarily disable any third-party antivirus to test.

• Update your graphics card driver, then reinstall the game and Vanguard if nothing else worked.

“Failed to launch: Something unusual happened…”

Riot’s dedicated page (May 14, 2026) says something on the PC is preventing the Riot Client or the game from launching or updating. Its steps:

• Disable DevOverrideEnable in the Windows Registry Editor by following Riot’s guide (Riot says this setting can interfere with system integrity checks).

• Clean boot, configure your firewall, update the graphics card driver, then reinstall the game.

• Remove and reinstall Vanguard: uninstall it manually, restart the PC, and launch the game to reinstall it.

“Your game requires a system restart to play” keeps coming back

Riot’s page (March 9, 2026) explains that this message is normal after you first install Vanguard: the Play button stays locked until you restart. If it will not go away after several restarts:

• Go to C:\Windows, delete the file vgkbootstatus.dat, and restart your device.

• Perform a clean boot.

• Do not run the game inside a virtual machine (VirtualBox, VMware, Parallels or similar): Riot says its games do not support it.

• Add firewall exceptions and temporarily disable any third-party antivirus to test.

Laptops with two GPUs

Riot’s “Use Your Dedicated GPU for Riot Games” guide (February 18, 2025) says Windows sometimes picks the power-saving GPU:

• Open Windows Settings > System > Display > Graphics, select the Riot game, click Options, choose “High performance”, then Save and restart the game.

• If the game is not listed, add it by browsing to its .exe file in the installation folder, then set it to High performance.

Overclocked PC

Riot’s “Temporarily Disable Overclocking” page (October 22, 2026):

• Return custom CPU, GPU or memory overclocking and tuning settings to default in the software you use (Riot names AMD Software: Adrenalin Edition and MSI Afterburner), restart, and test the game.

• If the overclock was set in the BIOS/UEFI, return those settings to their defaults; Riot says not to change BIOS settings at random and to check the manufacturer’s documentation if you are unsure.

What is not known

• These Riot pages are general troubleshooting guides: they do not link crashes to a specific League patch (patch 26.22 notes were published on November 3, 2026) and do not list affected PCs or graphics cards.

• These steps cover problems on your PC, not server outages. If your crashes started right after a patch or a Windows update, tell us in the discussion so others can compare.

Patch context: League of Legends patch 26.22 on TricknFix (https://tricknfix.com/articles/league-of-legends-patch-26-22-mel-midscope-tft-standalone-november-2026/). More League news and discussions: the #league-of-legends community (https://tricknfix.com/tags/league-of-legends/); Windows 11 guides: #windows-11 (https://tricknfix.com/tags/windows-11/).

Sources

• Riot Games Support, “Troubleshoot PC Game Crashes” (October 28, 2025), read November 11, 2026 (https://support.riotgames.com/en-us/riot/performance/troubleshooting-game-crashes-pc).

• Riot Games Support, “Fix My League: The First Steps to Tech Help” (May 18, 2026), read November 11, 2026 (https://support.riotgames.com/en-us/league-of-legends/performance/fix-my-league-the-first-steps-to-tech-help).

• Riot Games Support, “Troubleshooting Game Launching Errors” (May 19, 2026), read November 11, 2026 (https://support.riotgames.com/en-us/riot/performance/troubleshooting-game-launching-errors).

• Riot Games Support, “Error ‘Failed to Launch: Something unusual happened…’” (May 14, 2026), read November 11, 2026 (https://support.riotgames.com/en-us/riot/account/error-failed-to-launch-something-unusual-happened).

• Riot Games Support, “How to Fix ‘Your game requires a system restart to play’” (March 9, 2026), read November 11, 2026 (https://support.riotgames.com/en-us/riot/gameplay/how-to-fix-your-game-requires-a-system-restart-to-play).

• Riot Games Support, “Use Your Dedicated GPU for Riot Games” (February 18, 2025), read November 11, 2026 (https://support.riotgames.com/en-us/league-of-legends/performance/updated-client-performance-issues-multiple-graphics-cards-on-windows).

• Riot Games Support, “Temporarily Disable Overclocking” (October 22, 2026), read November 11, 2026 (https://support.riotgames.com/en-us/riot/performance/temporarily-disable-overclocking).

• Riot Games Support, “Vanguard Error Codes” (May 22, 2026), read November 11, 2026 (https://support.riotgames.com/en-us/riot/performance/vanguard-error-codes).

• Video “K/DA - FIRESTARTER ft. MIYEON and SOYEON of i-dle, Sophie Powers, Mimi Webb (Official Music Video)”, League of Legends channel, October 19, 2026 (https://www.youtube.com/watch?v=Mmw-PpWhKFg).

• Image: official K/DA Firestarter splash art from Riot Games’ Patch 26.22 Notes, November 3, 2026 (https://www.leagueoflegends.com/en-us/news/game-updates/league-of-legends-patch-26-22-notes/), © Riot Games.