Microsoft Windows Error Code 0xC00000AA: How to Fix It

Medium 30-60 minutes High Severity Verified June 2026
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Error Code
0xC00000AA
Brand
Microsoft Windows
Product Type
operating_system
Severity
High
DIY Difficulty
Medium
Estimated Fix Time
30-60 minutes
Error code 0xC00000AA, also known as STATUS_INSTRUCTION_MISALIGNMENT, indicates the CPU tried to execute an instruction at an unaligned memory address. This typically happens due to corrupted system files, faulty drivers, or hardware issues like a failing CPU or RAM. This guide provides step-by-step fixes to resolve the error.
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Tools You'll Need

How to Fix Error Code 0xC00000AA

  1. Restart Your Computer

  2. Run CHKDSK to Check Disk Errors

    This process can take a long time; do not interrupt it.

  3. Run System File Checker (SFC)

  4. Run DISM to Repair System Image

  5. Update or Roll Back Drivers

  6. Check for Windows Updates

  7. Test Your RAM for Errors

    Back up your data before testing RAM, as memory errors can cause data corruption.

  8. Perform a Clean Boot

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When to Call a Professional

If the error persists after all software fixes, the issue may be hardware-related (faulty CPU, motherboard, or RAM). In that case, consult a professional technician for hardware diagnostics and replacement.

Frequently Asked Questions

What does error 0xC00000AA mean?
It means STATUS_INSTRUCTION_MISALIGNMENT: your CPU attempted to execute an instruction at an unaligned memory address, often due to corrupted system files, bad drivers, or hardware issues.
Can error 0xC00000AA be caused by malware?
Yes, malware can corrupt system files or drivers, leading to this error. Run a full antivirus scan as part of troubleshooting.
Will resetting Windows fix error 0xC00000AA?
Yes, a Windows reset (keeping or removing files) can fix the error if it's caused by system file corruption. Go to Settings > Update & Security > Recovery > Reset this PC.
Is error 0xC00000AA a blue screen of death?
Yes, it often appears as a blue screen error on Windows, especially in Windows 10/11.
Does error 0xC00000AA indicate a hardware failure?
Not always, but it can. If software fixes fail, test RAM and CPU for defects. A failing CPU or motherboard can cause this error.

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