Reddit Validated Error Code 0xFFFFF805: How to Fix It

Medium 1-2 hours High Severity Verified June 2026
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Error Code
0xFFFFF805
Brand
Reddit Validated
Product Type
operating_system
Severity
High
DIY Difficulty
Medium
Estimated Fix Time
1-2 hours
Error code 0xFFFFF805 indicates a kernel-mode driver attempted to access an invalid memory address, often due to a buggy or incompatible driver. This guide will help you identify and fix the problematic driver to restore system stability.
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Tools You'll Need

How to Fix Error Code 0xFFFFF805

  1. Backup important data

    Backup data before proceeding to avoid loss if system becomes unstable.

  2. Boot into Safe Mode

    If unable to boot, use Windows Recovery Environment (WinRE) from a installation USB.

  3. Update critical drivers

  4. Roll back recent driver updates

  5. Run System File Checker (SFC)

    Do not close Command Prompt during scan.

  6. Check for Windows updates

  7. Use Driver Verifier to identify problematic driver

    Driver Verifier can cause repeated crashes; use only if other steps fail and ensure backups are made.

  8. Uninstall problematic drivers

  9. Perform System Restore

    This will undo recent system changes but not affect personal files.
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When to Call a Professional

If the error persists after all steps, or if you are uncomfortable using Driver Verifier or modifying system files, seek help from a professional technician to avoid further system damage.

Frequently Asked Questions

What does kernel-mode driver error 0xFFFFF805 mean?
It means a driver tried to access memory it shouldn't, typically due to a bug or incompatibility. It often causes Blue Screen of Death (BSOD).
Can outdated drivers cause error 0xFFFFF805?
Yes, outdated or buggy drivers are the most common cause. Updating or rolling them back often fixes the issue.
How do I boot into Safe Mode if my PC won't start?
Insert a Windows installation USB, boot from it, select 'Repair your computer' > Troubleshoot > Advanced options > Startup Settings > Restart, then press 4 for Safe Mode.
Will resetting Windows fix this error?
A full reset (keeping files or not) can resolve driver conflicts, but it should be a last resort. Try driver fixes first.
Is error 0xFFFFF805 hardware-related?
It's usually driver-related, but faulty RAM or storage can mimic it. Run a memory diagnostic (Windows Memory Diagnostic) to rule out hardware issues.

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