How to Fix HAL_IOMMU_INTERNAL_ERROR BSoD (Error Code 0x000001D9)

The HAL_IOMMU_INTERNAL_ERROR blue screen on Windows, indicated by the error code 0x000001D9, arises due to complications with the HAL IOMMU library. Several factors could contribute to this issue, including outdated or corrupted drivers, malware infections, damaged system files, conflicting applications, and potential hardware malfunctions.

Before attempting to resolve the issue, restart your computer, ensure that all Windows updates are installed, and disable any third-party antivirus programs. For many users, these preliminary steps may resolve the blue screen of death (BSoD)!

How to Resolve HAL_IOMMU_INTERNAL_ERROR in Windows?

Experienced Windows users are advised to scrutinize BSoD error logs, pinpoint the faulty component, and apply the corresponding solution. If possible, boot into Safe Mode with Networking to facilitate access.

1. Update All Drivers

1. Press Windows + X to open the Power User menu, then select Device Manager.
2. Expand the Display adapters section, right-click on the active GPU, and choose Update driver.
   

   

3. Click on Search automatically for drivers and allow Windows to install the most appropriate version found locally.
   

   

4. Be sure to update other key drivers on your PC, like the network adapter, storage drives, and any connected devices.
5. Finally, restart your computer and check for any improvements.

In most cases (around 60%), an outdated driver was the culprit behind the HAL_IOMMU_INTERNAL_ERROR in Windows, and updating the drivers resolved the issue.

If Windows is unable to locate an updated driver, visit the manufacturer’s website to download and install the latest version manually!

2. Repair Corrupted System Files

1. Press Windows + S to open Search, enter Command Prompt, and select Run as administrator.
   

   

2. Click Yes in the User Account Control prompt.
3. Enter the following commands one by one, pressing Enter after each:
   DISM /Online /Cleanup-Image /CheckHealth
DISM /Online /Cleanup-Image /ScanHealth
DISM /Online /Cleanup-Image /RestoreHealth
4. Next, run this command to initiate the SFC scan: sfc /scannow
   

   

5. Restart your computer to apply the changes.

If corrupted system files are at the root of the HAL_IOMMU_INTERNAL_ERROR BSoD, executing the DISM and SFC scans should restore any problematic files with their cached counterparts!

3. Conduct a Malware Scan

1. Press Windows + S to open Search, type Windows Security, and select the corresponding result.
2. Click on Virus & threat protection.
   

   

3. Choose the Scan options.
4. Opt for the Full scan option and click on Scan now.
   

   

5. Allow the malware scan to finish, which typically takes between 15-45 minutes, and observe if there are any improvements.

4. Check RAM and Drive for Faults

4.1 Test the RAM

1. Press Windows + S to open Search, type Windows Memory Diagnostic, and click the relevant result.
2. Choose Restart now and check for problems.
   

   

3. Wait for the scan to complete and review the mdsched log.

While the built-in Windows Memory Diagnostic tool is effective, if no issues are found, consider using Memtest86+, a sophisticated open-source utility that performs comprehensive tests on individual RAM modules.

If any issues arise during testing, replacing the defective RAM module is advisable.

4.2 Execute Check Disk

1. Press Windows + R to launch Run, type cmd, and press Ctrl + Shift + Enter .
   

   

2. Click Yes on the UAC prompt.
3. Input the following command and press Enter: chkdsk /r
4. If prompted to schedule the scan, press Y , hit Enter , and then restart your computer.
   

   

5. After running Check Disk, verify if the HAL_IOMMU_INTERNAL_ERROR has been resolved.

5. Remove Conflicting Applications

1. Press Windows + R to open Run, type appwiz.cpl, and hit Enter.
2. Identify the application installed around the time the BSoD first occurred, select it, and click Uninstall.
   

   

3. Follow the on-screen prompts to complete the uninstallation and restart your PC.

If the HAL_IOMMU_INTERNAL_ERROR continues to appear, residual files or registry entries from uninstalled programs may be to blame. In such cases, utilizing a reliable uninstaller software could help eradicate these remnants.

6. Remove Recent Windows Updates

1. Press Windows + I to open Settings, navigate to Windows Update in the sidebar, and click Update history.
   

   

2. Scroll down and select Uninstall updates.
3. Click the Uninstall option next to the most recent update you downloaded.
   

   

4. Confirm by clicking Uninstall in the prompt.
5. Restart the computer and check for any improvements.

7. Reinstall Windows

If all else fails to resolve the HAL_IOMMU_INTERNAL_ERROR, the final resort is to perform a clean installation of Windows. Given the risk of data loss, it’s advisable to back up critical files to external storage where possible.

To reinstall Windows, connect a formatted USB drive to your computer, visit Microsoft’s official site, download the Media Creation Tool, and create a bootable Windows USB. Adjust your PC’s boot order to prioritize the USB drive and proceed with the installation process.

One of these solutions should effectively resolve the HAL_IOMMU_INTERNAL_ERROR on Windows. If the problem still persists, consult a local service center for hardware diagnostics, as faulty hardware may be the cause.

If you have any questions or want to share additional solutions with our readers, please leave a comment below.

Author: Egor Kostenko

My goal is to make complex technical topics simple and accessible. On this site, I gather unique and useful content that not only solves users’ problems but also helps them better understand the capabilities of Windows.