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How to Fix ERROR_KM_DRIVER_BLOCKED 1930 (0x78A) [Complete Guide]

2024/09/04
PC Repair

Key Notes

  • The ERROR_KM_DRIVER_BLOCKED error occurs due to driver compatibility issues.
  • Changing system policies can increase security risks.
  • Contacting support should be a last resort if the issue persists.

Resolving ERROR_KM_DRIVER_BLOCKED: A Comprehensive Guide

Navigating printer driver installation issues in Windows can be daunting, especially when encountering the ERROR_KM_DRIVER_BLOCKED message. This guide provides in-depth steps to effectively troubleshoot and resolve this problem.

Detailed Steps to Resolve ERROR_KM_DRIVER_BLOCKED

Step 1: Obtain a Compatible Driver Version

Begin by removing existing printer drivers using a reputable driver uninstaller tool. Next, visit the printer manufacturer’s website and download the latest driver version that aligns with your version of Windows.

Pro Tip: Ensure you’ve uninstalled any remnants of old drivers to avoid conflicts.

Step 2: Install the Driver in Compatibility Mode

  1. Right-click on the downloaded driver setup file and select Properties.
  2. Go to the Compatibility tab, enable Run this program in compatibility mode for, and choose a prior version of Windows.
  3. Click Apply and then OK to save changes.
  4. Proceed to install the driver.
  5. If issues persist, attempt earlier Windows versions until successful.

Step 3: Conduct a Malware Scan

  1. Press Windows + S, type Windows Security, and open the application.
  2. Select Virus & threat protection.
  3. Choose Scan options.
  4. Opt for Full scan and click Scan now.
  5. Allow the scan to complete, which may take between 15-45 minutes.

Pro Tip: Always download drivers from official sources to reduce the risk of malware.

Step 4: Reinstall the Driver with Adjusted Settings

4.1 Uninstall the Printer Driver and Software:

  1. Press Windows + R, type appwiz.cpl and hit Enter.
  2. Locate your printer software, select it, and click Uninstall.
  3. Follow the prompts to complete the uninstallation.

4.2 Modify the Registry:

  1. Press Windows + R, type regedit and press Enter.
  2. Accept the User Account Control prompt.
  3. Navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows NT.
  4. Create a new key named Printers.
  5. Under Printers, add a DWORD value named KMPrintersAreBlocked with a value of 1.
  6. Create another key called PointAndPrint and add necessary properties with specified values for enhanced functionality.

4.3 Stop the Print Spooler Service:

  1. Press Windows + R, type services.msc and press Enter.
  2. Find Print Spooler, right-click and select Stop.

4.4 Rename Critical Folders:

  1. Open File Explorer, navigate to C:\Windows\System32\spool\drivers.
  2. Rename both the W32X86 and x64 folders to W32x86.old and x64.old.

4.5 Reinstall the Printer Driver:

Now execute the driver installation file that previously triggered the error.

Step 5: Reconfigure Group Policy Settings

  1. Press Windows + R, type gpedit.msc and hit Enter.
  2. Navigate to Computer Configuration > Administrative Templates > Printers.
  3. Locate and edit the Disallow installation of printers using kernel-mode drivers policy to Disabled.
  4. Apply your changes and restart your computer to see if the error resolves.

Step 6: Reset Windows to Factory Defaults

If all else fails, resetting Windows could be the final solution. To do this, press Windows + I to open Settings, navigate to System > Recovery, and select Reset PC. Choose whether to keep your files or remove everything and follow the prompts to complete the reset.

Step 7: Reach Out to Support

If after all these steps the error persists, consider reaching out for assistance. Start with the printer manufacturer’s support for compatible driver versions, or contact Microsoft support as a secondary option.

Additional Tips

  • Ensure all your Windows updates are installed.
  • Consider using a different USB port for the printer.
  • Disable unnecessary printer-related services when not in use.

Summary

Resolving the ERROR_KM_DRIVER_BLOCKED error requires a methodical approach, including obtaining compatible drivers, conducting malware scans, adjusting group policies, and if necessary, resetting Windows. Most users can resolve the issue through the steps outlined above without requiring direct support.

Conclusion

In conclusion, the ERROR_KM_DRIVER_BLOCKED message might seem daunting, but by following the outlined procedures, you can effectively troubleshoot and resolve printer driver issues in Windows. Always remember to prioritize security while making system changes, and don’t hesitate to seek help when necessary.

FAQ (Frequently Asked Questions)

What causes the ERROR_KM_DRIVER_BLOCKED error?

This error typically arises when a printer driver is incompatible with policies set on your computer that prevent the use of certain drivers.

How can I find compatible printer drivers?

Visit the printer manufacturer’s website to download the latest driver that corresponds with your version of Windows.

PC Repair