0x0000078a – Error_Km_Driver_Blocked – the Printer Driver Is Not Compatible With a Policy Enabled on Your Computer That Blocks NT 4.0 Drivers

The error code 0x0000078a means your printer driver is not working because it's too old for your computer.

This happens when the driver is from NT 4.0, a very old system that your computer doesn't allow. Symptoms include not being able to print anything.

To fix this, you can look for new drivers from the printer's website, change some settings on your computer, or remove old drivers using Device Manager.

It's important to solve this issue so you can print easily. To prevent it in the future, always keep your printer drivers updated.

Error meaning:

The "Error_Km_Driver_Blocked" means that the printer driver can't work because it doesn't follow the rules of the computer's security system.

This stops the driver from loading and prevents printing from happening.

Causes:

Potential reasons for the "Error_Km_Driver_Blocked" include:

1. An incompatible printer driver is installed, especially ones made for NT 4.0.
2. Group policies in the operating system block outdated drivers for security.
3. Improper installation or corruption of the driver during setup.
4. The printer software is not updated or patched, causing it to not match the system policies.
5. User permissions and administrative settings may prevent the installation of certain drivers.

Symptoms:

Symptoms of "Error_Km_Driver_Blocked":

1. You cannot print documents.
2. The printer driver is not recognized by the system.
3. You see error messages saying the printer driver is blocked.
4. The computer runs slowly or freezes when trying to print.
5. Printers that used to work stop responding after system updates or changes.
6. Your printing tasks get interrupted, causing problems with your work.

Solutions:

Step 1: Check for Updated Printer Drivers

Go to the printer manufacturer's website and look for the latest printer drivers that match your computer's operating system.

Download and install the updates.

Step 2: Modify Group Policy Settings

If needed, change the Group Policy settings to allow the installation of NT 4.0 drivers.

Be careful with this step and ask an adult or IT professional for help.

Step 3: Uninstall Conflicting Drivers

Open Device Manager on your computer.

Find and uninstall any printer drivers that may cause problems.

After uninstalling, restart your computer.

Step 4: Try a Different Printer Model

If the error still happens after the previous steps, think about using a different printer that works better with your computer's settings.

Following these steps can help fix the "Error_Km_Driver_Blocked" issue and get your printer working again.

Impact:

The "Error_Km_Driver_Blocked" issue affects a system's performance and functionality in several ways:

1. Printing Stops: Employees cannot print important documents.
2. Work Delays: Projects may take longer to finish because printing is interrupted.
3. Frustration Grows: Workers may feel angry or stressed when they can't print what they need.
4. IT Help Needed: The IT team has to spend time fixing the problem instead of helping with other tasks.
5. Money Loss: Businesses might lose money because of downtime or having to pay for extra support.
6. Compliance Risks: In some industries, not being able to print required documents can lead to serious legal problems.

Relevance:

The "Error_Km_Driver_Blocked" issue is mainly related to older Windows NT 4.0 drivers that don't work well with newer versions of Windows, like Windows 10 or Windows 11.

This error can cause problems when trying to print, which may slow down work and lead to missing deadlines.

It's important for businesses to keep their drivers and operating systems updated so they can print without any issues.

Understanding this error helps organizations manage their resources better and keep things running smoothly.

Prevention:

To avoid the "Error_Km_Driver_Blocked" in the future, follow these steps:

1. Update Drivers Regularly: Go to the printer manufacturer's website and download the latest drivers for your printer.
2. Use Supported Drivers: Make sure you only install drivers that are compatible with your operating system. Avoid using old drivers or those made for NT 4.0.
3. Set Up a System Policy: Use Group Policies to stop the installation of outdated drivers on your computer.
4. Check Installed Drivers: Regularly look at the drivers installed on your computer to find any that might not be allowed.
5. Teach Users: Explain to everyone who uses the printer why it's important to use the correct drivers.
6. Backup Drivers: Keep a backup of your drivers so you can quickly restore them if something goes wrong.

People Also Ask

Are There Any Specific Printer Models Affected by This Error?

Many printer models can have problems because of driver rules, especially older ones or those using NT 4.0 drivers. To find out if your printer is affected, it's best to check the information from the manufacturer.

How Can I Check My Windows Version for Compatibility?

To check your Windows version, go to "Settings," then click on "System," and choose "About." You will see your Windows edition and version number there. This information helps you know if your computer can run certain programs or drivers.

Is There a Way to Temporarily Bypass the Policy?

To temporarily bypass a policy, you need special admin rights. You can use the Group Policy Editor to change settings, but be careful! These changes can affect how your system works and its safety. Remember to change everything back when you're done.

Can Third-Party Software Help Resolve This Error?

Yes, third-party software can help fix driver problems. It might let you get around some rules. But be careful! Using this software could make your computer less stable or safe. Always think twice before trying it.