Windows system errors can be frustrating and disruptive, especially when you encounter less common codes like ERROR_391. If you’ve stumbled upon this error, don’t worry—you’re not alone. This guide will walk you through detailed, easy-to-follow steps to diagnose and fix Windows System Error Code ERROR_391, helping get your PC back up and running in no time.
What is Windows System Error Code ERROR_391?
Before diving into fixes, let’s understand what ERROR_391 means. This error code typically signals a file system or driver-related issue, often linked to device communication problems or corrupted system files. It may occur during file transfers, device driver installations, or when specific hardware devices fail to respond properly.
Common Symptoms of ERROR_391
You might notice the following:
- Sudden failure during file transfer or copying
- Device not recognized or failing to communicate properly
- Pop-up error message stating: “Windows System Error Code ERROR_391”
- Slow or unresponsive Windows performance related to device operations
Why Does ERROR_391 Occur?
- Corrupted or outdated device drivers
- Faulty USB or external device connection
- Corrupted system files or registry issues
- Interference from third-party software
- Hardware failure or connection issues
Step 1: Restart Your Computer
Before doing anything complex, try restarting your PC. This quick step can often clear temporary system glitches that cause ERROR_391.
Step 2: Check Device Connections and Hardware
- Unplug the device causing the error.
- Check for any physical damage on cables or ports.
- Try connecting the device to a different USB port.
- If possible, connect the device to another computer to rule out hardware failure.
Step 3: Update or Reinstall Device Drivers
Outdated or corrupted drivers are a major cause of error codes like ERROR_391.
How to update drivers:
- Press Windows + X, select Device Manager.
- Locate the device showing issues (usually listed with an exclamation mark).
- Right-click the device and choose Update driver.
- Select Search automatically for updated driver software.
- Follow prompts to install any available updates.
- Restart your PC after updating.
How to reinstall drivers:
- In Device Manager, right-click the problematic device.
- Choose Uninstall device.
- Disconnect the device and restart Windows.
- After restart, reconnect the device for Windows to reinstall drivers automatically.
Step 4: Run the Windows System File Checker (SFC)
Corrupted system files can cause ERROR_391, and the SFC tool can help repair them.
- Press Windows + S, type
cmd. - Right-click Command Prompt and select Run as administrator.
-
In the command window, type:
sfc /scannow
- Press Enter and wait for the process to complete.
- Restart your computer after the scan finishes.
Step 5: Check Disk for Errors (CHKDSK)
File system errors may trigger ERROR_391. Running a disk check can fix corrupted sectors.
- Open Command Prompt as administrator.
-
Enter the command (replace
C:with your drive letter if different):chkdsk C: /f /r
- You may be prompted to schedule the scan next time your computer restarts – type Y and press Enter.
- Restart your PC to allow the disk check to run.
Step 6: Perform a Clean Boot
Sometimes, third-party software conflicts cause hardware communication errors.
- Press Windows + R, type
msconfig, and hit Enter. - Go to the Services tab.
- Check Hide all Microsoft services.
- Click Disable all.
- Go to the Startup tab and click Open Task Manager.
- Disable all startup items.
- Close Task Manager and click OK in the System Configuration window.
- Restart your PC and attempt to reproduce the ERROR_391 issue.
If the error does not appear again, one of the disabled apps or services is the culprit. Gradually re-enable services and startup items to identify the problem.
Step 7: Update Windows to the Latest Version
Keeping Windows updated patches bugs and driver issues.
- Go to Settings > Update & Security > Windows Update.
- Click Check for updates.
- Download and install any available updates.
- Restart your computer.
Step 8: Restore Your System to a Previous Point
If the issue started recently, a system restore can roll back Windows to when everything was working.
- Type Create a restore point in the Windows search and open it.
- Click System Restore.
- Choose a restore point dated before the ERROR_391 appeared.
- Follow the prompts to restore your system.
Step 9: Check for Hardware Issues
If none of the above steps work, the problem might be with your hardware.
- Use built-in diagnostics (e.g., Dell SupportAssist, HP PC Hardware Diagnostics).
- Consider consulting a professional technician.
- Replace faulty devices or cables as needed.
Windows System Error Code ERROR_391 can be a nuisance, but with patience and the steps above, it’s usually fixable without professional help. Always back up important data before performing system repair tasks. If you’re unsure, seeking expert assistance is a wise choice.
SEO Summary: How to Fix ERROR_391 Windows System Error
To fix Windows System Error Code ERROR_391:
- Restart your PC
- Check device connections
- Update or reinstall device drivers
- Run System File Checker (SFC)
- Run CHKDSK to fix disk errors
- Perform a clean boot to isolate conflicts
- Update Windows fully
- Use System Restore if needed
- Check hardware integrity
By following these steps, you can resolve the error and enjoy seamless Windows performance!
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