Fix ERROR_INSTRUCTION_MISALIGNMENT (0x225) on Windows 10/11

Cause #1: ARM64 Driver Running on x64 Emulation

In my years fixing small business PCs, I've seen this error most often on Surface Pro X or other ARM-based Windows machines running x64 apps in emulation. The Windows on ARM64 emulator (that's what makes x64 software run on ARM chips) sometimes loads a driver that wasn't built for that setup. The result? ERROR_INSTRUCTION_MISALIGNMENT popping up when you launch that software or plug in a device.

Last month a client couldn't print from their accounting app on a Surface Pro X — every print job threw 0x00000225. The printer driver was the old x86 version, not the ARM64 native one.

The fix: get the ARM64 version of the driver or app. Most major hardware manufacturers now ship ARM64 drivers. Go to the device manufacturer's support site, download the Windows 11 ARM64 driver, and install it.

If the app itself is the problem (no driver involved), reinstall it but force the ARM64 version. Microsoft Store automatically picks the right one, but if you downloaded a standalone installer, you might have grabbed the x64 one by mistake. Check the file name — look for “arm64” or “ARM64” in the installer name.

How to check if you're on ARM: press Win + R, type msinfo32, and look at “System Type”. It'll say “ARM64-based PC”. If it says “x64-based”, this cause doesn't apply — skip to cause 2.

Cause #2: Outdated or Corrupt Device Driver

Even on regular Intel or AMD machines, this error sneaks in when a driver is badly out of date or got corrupted after a Windows update. I've seen it happen with graphics drivers and network adapters most often. One client had it every time they connected an external GPU dock — the dock's firmware was fine, but the driver was from 2019 and Windows 11 22H2 didn't like it.

Here's the straightforward fix:

1. Open Device Manager (Win + X → Device Manager).
2. Look for devices with a yellow exclamation mark. That's your culprit.
3. Right-click it → Update driver → Search automatically.
4. If Windows finds nothing, go to the manufacturer's website and grab the latest driver for your exact Windows version (10 or 11, 64-bit).

But if the driver is already “up to date” and the error persists, try uninstalling and reinstalling. Right-click the device → Uninstall device → check “Delete the driver software for this device” → restart. Windows will reinstall the basic driver on boot. That often clears the misalignment because the corrupt version gets flushed out.

Pro tip: if you've recently installed a new driver and the error started after that, roll back instead. Right-click → Properties → Driver tab → Roll Back Driver. That's saved me more than once when a “critical update” broke something.

Cause #3: Faulty Memory or Overclocked RAM

This one's less common but real — misalignment errors can point to failing RAM. I had a client whose server kept throwing 0x00000225 in the event log, but only under heavy load. Turned out one stick of their DDR4 was failing at the rated XMP speed.

Don't jump to buying RAM yet. Do this first:

• Run Windows Memory Diagnostic: press Win + R, type mdsched.exe, choose restart now.
• If that finds nothing, check if your RAM is overclocked (XMP or EXPO profile in BIOS). If yes, disable it and test again. Some RAM kits aren't stable at their advertised speeds with certain motherboards.

If you're running an underpowered or mismatched RAM setup (like mixing two brands), that can also cause alignment issues. The fix is to remove one stick at a time and test. Pain in the rear, but it's the only way to isolate a memory fault.

One more thing: if this error happens randomly during boot, not when running an app, it's almost certainly hardware. I'd also check your storage drive health — a failing SSD can cause corrupted data that leads to weird errors. Run chkdsk C: /r from an elevated command prompt, but be prepared to wait.

Wrap-up: Quick Reference

That's it. Start with cause 1 if you're on ARM, cause 2 if you're not. If neither solves it, cause 3 is your next stop. You'll have it sorted in under an hour, assuming you're not unlucky enough to need new hardware.