You’re finally sitting down after a long day, ready to climb the ladder, and then you see it. That annoying little pop-up. Sorry we've detected a problem with your installation league 2025 is the kind of error that makes you want to put your head through your monitor. It’s frustrating because it doesn't really tell you what went wrong, just that the Riot client is unhappy. Honestly, it’s usually something small, but tracking down that one corrupted file feels like looking for a needle in a digital haystack.
League of Legends has become a massive, tangled web of code over the last decade. By the time 2025 rolled around, the integration between the Riot Client, Vanguard, and the game itself became even more sensitive. One tiny hiccup during a patch update or a flicker in your internet connection can bork the whole thing. It sucks. But before you go nuking your entire hard drive and reinstalling the whole 30GB+ game, there are a few things that actually work for most people.
Why the 2025 Client is Acting Up
Most players think the game files are the culprit. Sometimes they are. But more often than not, the "detected a problem" error is actually a handshake issue. It’s the Riot Client trying to talk to the Vanguard anti-cheat and getting a busy signal. Since Vanguard runs at the kernel level, if it’s even slightly out of sync, the game won't launch. It just throws that generic error.
We also have to look at how Windows 11 handles "Controlled Folder Access." Microsoft has been getting more aggressive with security. If Windows decides Riot doesn't have permission to write to your C:/Games folder during a background update, the installation gets flagged as "corrupted." It’s not actually broken; it’s just locked out. This happens way more than people realize, especially after those big seasonal Windows updates.
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Another weirdly common trigger is drive fragmentation—or more specifically, SSD "trim" issues. If you’re running League on an almost-full drive, the client might struggle to find contiguous space for temporary patch files. It panics. It gives up. Then it shows you that dreaded message. Basically, the game is a bit of a diva about its storage space.
The First Line of Defense: The Hextech Repair Tool
You’ve probably heard of it. The Hextech Repair Tool is Riot’s own "I give up" button. It’s been around forever, but for the 2025 season, they’ve actually made it slightly more competent.
You should run this as your very first step. It forces a re-patch and can often bypass the "detected a problem" loop without a full reinstall. When you open it, make sure you check the "Force Repatch" box. Don't just let it do the surface-level scan. You want it to dig. It’ll check the checksums of every major file and compare them to the master manifest on Riot’s servers. If something is even one byte off, it’ll grab a fresh copy.
Dealing with the Vanguard Factor
Since 2024 and 2025, you can't talk about League errors without talking about Vanguard. If you get the installation error, try this: go to your system tray, right-click the Vanguard icon, and exit. Then, go to your "Add or Remove Programs" and uninstall Riot Vanguard specifically. Don't touch League yet. Just Vanguard.
Once it's gone, restart your PC. This is non-negotiable. You have to restart so the drivers clear out. When you boot back up, open the Riot Client. It’ll realize Vanguard is missing and prompt you to "Repair" or "Update." Let it do its thing. Often, a fresh Vanguard install solves the "detected a problem with your installation" error because it resets the security handshake that was blocking the game from launching.
Permissions and Registry Gremlins
Sometimes the problem isn't the files, but the "memory" of the files. Windows stores registry keys that tell the OS where League is and how it should run. If you moved the game from your D: drive to your C: drive by dragging and dropping folders, you’ve likely broken these links.
- Run as Administrator: It sounds cliché, but right-click the Riot Client and "Run as Administrator." This bypasses some of those folder permissions I mentioned earlier.
- Compatibility Mode: Sometimes Windows tries to run the 2025 client in a compatibility mode for an older version of Windows. Right-click
LeagueClient.exe, go to Properties, and make sure all compatibility boxes are unchecked. The game is designed for modern Windows; it doesn't need to pretend it's running on Windows 7.
The DNS Flush Trick
Believe it or not, a network "hiccup" can cause a local installation error. If the client tries to verify your files but the connection to the verification server times out, it might falsely report that your installation is corrupted. It’s a bit of a "false positive" error.
Open your Command Prompt (type cmd in the start menu) and run it as an admin. Type ipconfig /flushdns and hit enter. Then type netsh winsock reset and hit enter. Restart your computer. This clears out the "pipes" and ensures your PC is actually talking to Riot’s patch servers correctly. It’s a long shot, but it fixes the problem for about 10% of users who are stuck in an infinite "Repair" loop.
When to Actually Reinstall
If you’ve tried the Hextech tool, reinstalled Vanguard, and flushed your DNS, and you're still seeing Sorry we've detected a problem with your installation league 2025, it’s time. But don't just hit uninstall.
You need a clean slate. Uninstall the game through the Riot Client, then manually go to C:/Riot Games (or wherever you put it) and delete the entire folder. Then, go to %localappdata% in your file explorer and delete the "Riot Games" folder there too. This wipes your local settings and cached login data. Most people skip this step, but those cached files are often where the corruption lives. If you don't delete them, the "new" installation will just pick up the old, broken settings and you’ll be right back where you started.
Actionable Steps to Get Back into the Rift
To fix this properly, follow this specific sequence. Don't skip around.
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- Close all Riot processes in the Task Manager (Ctrl+Shift+Esc). Kill everything: RiotClientServices, League of Legends, and Vanguard.
- Delete the 'Logs' and 'Config' folders inside your League of Legends directory. This won't delete the game, just your settings. The game will generate fresh, clean ones when it starts.
- Check your Disk Space. You need at least 15GB of free space for the client to process updates, even if the game is already installed. If you're red-lining on storage, the "detected a problem" error is almost guaranteed.
- Whitelist the game in your Firewall. Go to "Allow an app through Windows Firewall" and make sure
LeagueClient.exeandRiotClientServices.exeare both checked for Private and Public networks. - Disable "Full-Screen Optimizations." Right-click the League executable, go to Properties > Compatibility, and check "Disable full-screen optimizations." This is a known fix for 2025 client stability.
If you’re on a laptop, make sure you aren't in "Battery Saver" mode. Some aggressive power-saving settings throttle the CPU so hard during the client’s file-check process that the client thinks the process has hung and reports a "detected problem." Plug it in, set it to "High Performance," and try one more time. Usually, one of these tweaks will get you past the loading screen and back into the game.