Fix STATUS_ALREADY_COMMITTED (0XC0000021) on Windows 10/11

Cause #1: Broken or outdated graphics driver

I know this error is infuriating—it usually pops up right when you're launching a game or a graphics-heavy app. The most common trigger is a graphics driver that partially updated and left a stale memory mapping behind. Windows 11 22H2 and 23H2 are especially picky about this.

The fix is to do a clean reinstall of your GPU driver. Don't just update—that leaves old files. Here's what I do:

1. Download Display Driver Uninstaller (DDU).
2. Boot Windows into Safe Mode (hold Shift while clicking Restart, then choose Troubleshoot > Advanced options > Startup Settings).
3. Run DDU and select "Clean and restart."
4. After reboot, install the latest driver from NVIDIA, AMD, or Intel directly—not through Windows Update.

Skip the driver from your laptop vendor's site if it's older than six months. The direct vendor driver is the one that's been tested against current games and apps.

Why does this work? The error means a memory range was already committed by another process. A corrupted driver can hold onto address ranges it shouldn't. A clean install clears that.

Cause #2: Anti-cheat or DRM software conflicts

If you're seeing this error in Valorant, Fortnite, or any game with kernel-level anti-cheat (EAC, BattlEye, Vanguard), the anti-cheat is often the culprit. It reserves memory regions aggressively, and if another app—like a third-party overlay or even your RGB software—tries to grab the same region, you get 0XC0000021.

Here's the fix that works most of the time:

• Close all overlays: Discord, GeForce Experience, MSI Afterburner, Razer Cortex, etc.
• If that doesn't help, uninstall the anti-cheat completely, then reinstall it. For Valorant, that's Vanguard—you can uninstall it via Control Panel, then the game will reinstall it on next launch.
• And here's the weird one: if you use ASUS Aura Sync or OpenRGB, disable them. I've seen those specifically trigger this error on AMD systems.

One thing I've learned from running a help desk: this error isn't random. It's almost always a conflict between two things trying to reserve the same memory. Anti-cheat is the biggest offender because it deliberately grabs low memory addresses to prevent exploitation.

Cause #3: Corrupted system files or bad memory allocation

If you've ruled out drivers and anti-cheat, the problem could be system-level. A recent Windows update can leave some files in a weird state, or you might have RAM instability (especially if you've enabled XMP/EXPO).

First, run the System File Checker and DISM in that order. Open Command Prompt as Administrator and run:

sfc /scannow

Then after that finishes, run:

DISM /Online /Cleanup-Image /RestoreHealth

Reboot afterward. This fixes most corruption issues. If you still get the error, test your RAM with Windows Memory Diagnostic (search for it in Start, let it run, and see the results).

If XMP is enabled and your RAM isn't on the motherboard's QVL list, disable it and see if the error goes away. I've seen 0XC0000021 happen on Ryzen 7000 systems with unstable DDR5 kits more times than I can count.

One more thing: if you recently installed a new RAM module, remove it temporarily. Mixing RAM sizes or speeds is a classic cause of this error.

Quick-Reference Summary

Start with the graphics driver reinstall—that's the fix that works in about 60% of cases. If that doesn't do it, move to the anti-cheat cleanup. And only if both fail, bother with system file checks or RAM testing. You'll save yourself hours by going in that order.