[Fix] System Thread Exception Not Handled Nvlddmkm.sys (100% Working)

Edwin Parker
By Edwin Parker 14 Min Read
14 Min Read

Have you ever been working on your computer and suddenly, out of nowhere, a big blue screen pops up with a message that says something like “System Thread Exception Not Handled”? If you’re using an Nvidia GPU on your Windows computer, you might have seen this scary screen, which is known as the Blue Screen of Death (BSOD). It’s like your computer’s way of saying, “Hey, I’m having a big problem here!”

The thing about this Nvlddmkm.sys error is that it’s a bit of a mystery – it doesn’t happen for the same reason for everyone. That means if your computer is showing this error, you might be scratching your head, wondering why it happened and what you can do about it.

But here’s the good news: you don’t need to panic! We’re here to guide you through some simple steps to get rid of this error. Let’s not waste any more time and dive right into solving this problem together.

Factors That Cause the System_Thread_Exception_Not_Handled Nvlddmkm.sys error?

Ever wondered what causes that annoying Nvlddmkm.sys error on your computer? It’s like trying to figure out why your car won’t start – there could be a few reasons. Let’s break down the most common culprits that lead to this frustrating Blue Screen of Death (BSOD) issue:

1. Incompatible Graphics Drivers

Think of your graphics driver as the bridge between your computer’s brain (the operating system) and its eyes (the graphics card). If this bridge, specifically the Nvlddmkm.sys (which stands for Nvidia Windows Longhorn Display Driver Model Kernel Mode driver), isn’t the right fit for your operating system, it’s like trying to fit a square peg in a round hole. Result? Your computer throws a tantrum and shows you the BSOD.

2. Conflict Between Voltage and Memory Timing

Every graphics card has its own voltage and timing information. Imagine these as the rhythm and pace of a dance. If the voltage (the rhythm) and the memory timing (the pace) are out of sync, your computer’s dance moves get clumsy, leading to the Nvlddmkm.sys error.

3. Overheating

Your GPU (Graphics Processing Unit) is like an athlete – it needs to stay cool to perform well. If it gets too hot, its performance drops, and it can get damaged. This overheating can be a big reason why you’re seeing the Nvlddmkm.sys error. It’s like running a marathon in scorching heat without water – not a good idea for your GPU!

4. Issues With the RAM

Your computer’s RAM (Random Access Memory) is like its short-term memory. It’s crucial for running applications and processes. Sometimes, issues with RAM can cause memory problems that trigger the Nvlddmkm.sys error. It’s like trying to remember too many things at once and getting all jumbled up!

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5. Restricted Features of GPU

Imagine your graphics card has certain features that are off-limits or restricted by your operating system. It’s like having a supercar but not being allowed to drive it faster than 30 mph. If you accidentally “break the rules” and use these restricted features, you might end up facing the Nvlddmkm.sys error. It’s all about staying within the limits set by your operating system.

6. GPU Overload

Normally, your CPU (Central Processing Unit) handles most of the computer’s processes. But if you’re running a lot of programs at once, the CPU might get overwhelmed and pass some of the workload to the GPU. This is like asking one person to do the work of two. If your GPU can’t handle this extra load, it might lead to the Nvlddmkm.sys error. It’s important not to overburden your GPU to avoid this problem.

Methods To Fix the Nvlddmkm.sys Error

Are you ready to tackle the Nvlddmkm.sys error head-on? Let’s go through some methods that can help fix this issue. It’s like being a detective – we’ll try different solutions until we crack the case!

Method 1: Update the Graphics Drivers

Updating your graphics drivers is like giving your computer a fresh start. Here’s how you can do it:

  1. Access Device Manager:
    • Press the Windows + X keys together. This opens up a menu that’s like a shortcut to some important features of your computer.
    • Choose “Device Manager” from this menu. It’s the place where you can see all the hardware connected to your computer.
  2. Update the Driver:
    • In the Device Manager, look for “Display Adapters” and click on it to see what’s under it. This is where your graphics card lives.
    • Find your graphics driver, right-click on it, and choose “Update Driver.”
    • Select “Automatically search for drivers.” This lets your computer do the detective work to find the latest driver for your graphics card.
  3. Check the Error:
    • After updating, restart your computer and see if that pesky Nvlddmkm.sys error has said goodbye.

If this method doesn’t work, don’t lose hope! We have more tricks up our sleeve. Keep reading for other methods to solve this issue.

Method 2: Uninstall Corrupted Drivers

Sometimes, the solution to the Nvlddmkm.sys error is like fixing a puzzle with a missing piece – you need to remove the piece that doesn’t fit (corrupted drivers) and replace it with the right one. Here’s how to do it:

Step 1: Boot into Safe Mode

  • Why Safe Mode? It’s like entering a special mode where Windows runs with the minimum necessary features, making it easier to troubleshoot problems.
  • How to Enter Safe Mode:
    1. Restart your PC and, during the boot-up process, keep pressing the F11 key.
    2. You’ll see a recovery menu. Go to Troubleshoot > Advanced options > Startup Settings.
    3. Choose Enable Safe Mode by pressing 4 or F4.
  • What Happens Next? Your PC will start in Safe Mode, a simpler environment for fixing issues.

Step 2: Identify the Corrupted Driver

  • Finding the Problem Child:
    1. Press Windows + R keys to open the Run dialog box.
    2. Type eventvwr and hit Enter to open the Event Viewer.
    3. Navigate to Windows Logs > System.
    4. Look for error logs, especially ones mentioning SYSTEM_THREAD_EXCEPTION_NOT_HANDLED and nvlddmkm.sys.
  • What This Means: If you see these errors, it’s likely the display card driver is the troublemaker.
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Step 3: Reinstall the Corrupted Driver

  • Roll Back or Uninstall:
    1. Press Windows + X and choose Device Manager.
    2. Expand Display Adapters, right-click on the problematic driver.
    3. Go to Properties > Driver tab.
    4. Try Roll Back Driver first – select a reason and click Yes.
    5. If rolling back doesn’t fix the issue, choose Uninstall Device.
  • Reinstall the Driver:
    • After uninstalling, restart your PC. Windows should automatically try to reinstall the driver. If it doesn’t, go back to the Device Manager and check for updates.

Method 3: Fix Damaged or Corrupted Files

If the Nvlddmkm.sys error is still playing hard to get, it might be due to damaged or corrupted files in your system. Think of it like fixing a leaky pipe in your house – you need the right tools and steps. Here are three handy tools to help you patch things up:

Fix 1: Using the CHKDSK tool

  • What It Does: This is like a health check for your computer’s hard drive, looking for and fixing problems.
  • Steps to Use CHKDSK:
    1. Press Win + R, type cmd in the Run box.
    2. Press Ctrl + Shift + Enter to open Command Prompt as Administrator.
    3. Type CHKDSK C: /F /R and press Enter. (C: is your system drive; change it if your Windows is on a different drive.)
    4. If prompted to schedule a check disk on the next restart, type Y and hit Enter.
    5. Restart your PC. It will scan and fix any issues it finds.

Fix 2: Using the System File Checker tool

  • What It Does: This tool is like a detective. It scans for corrupted system files and repairs them.
  • Steps to Use SFC:
    1. Run Command Prompt with admin privileges, as mentioned before.
    2. Type SFC /scannow and press Enter.
    3. Let the system file checker do its job. It’ll scan and repair files automatically.

Fix 3: Using the DISM tool

  • What It Does: DISM stands for Deployment Image Servicing and Management. It’s like a surgeon for your Windows image, fixing system corruption.
  • Steps to Use DISM:
    1. Open Command Prompt as administrator.
    2. Type DISM /Online /Cleanup-Image /RestoreHealth and press Enter.
    3. Be patient; this process can take some time. It works on fixing issues in the background.

Method 4: Underclock the Settings of Your GPU

Underclocking your GPU can be like turning down the heat on a stove – it can prevent your system from overheating and potentially solve the Nvlddmkm.sys error. Here’s how to do it:

  1. Using MSI Afterburner:
    • Download and launch the MSI Afterburner utility. It’s a popular tool for managing your GPU’s settings.
    • Look for a slider labeled ‘Core Clock’. This controls the speed of your GPU’s processor.
    • Gently move the slider to the left, decreasing the value by about -50. This reduces the clock speed, which can lower the temperature and voltage of your GPU.
    • Apply the new settings and restart your computer to see if the error is resolved.
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Method 5: Perform System Restore

If all else fails, turning back time on your computer with a system restore might be the answer. It’s like using a time machine to go back to a point where everything was working fine.

  1. Accessing System Restore:
    • Go to Settings > Update & Security > Recovery.
    • Under ‘Advanced startup’, click Restart now.
    • After your PC restarts, choose Troubleshoot > Advanced options > System Restore.
  2. Performing the Restore:
    • Follow the on-screen instructions to select a restore point. Choose a date before you started experiencing the Nvlddmkm.sys error.
    • Provide your account name and password if prompted.
    • Let the system restore process complete. This can take a while, so be patient.


And there you have it! After exploring this guide, you’re now equipped with the knowledge and tools to tackle the infamous System_thread_exception_not_handled Nvlddmkm.sys error – that notorious Blue Screen of Death (BSOD) on your computer. It’s like you’ve become a tech wizard ready to cast a spell and banish this pesky error!

We’re super excited to hear about your journey in fixing this issue. Which method worked for you? Did you find a particular step especially helpful? Your feedback is like a treasure for us and others who might face the same problem.

Remember, this guide is here for you to come back to, just in case this error decides to make an unwanted comeback. Bookmark it, save it, or keep it handy – it’s your shield against the BSOD dragon.

We can’t wait to hear which method did the trick for you. Drop a comment, share your experience, and let’s celebrate your triumph together. Happy computing, and may your screen always be the right kind of blue!

Frequently Asked Questions

What is the Nvlddmkm.sys error?

The Nvlddmkm.sys error is a type of Blue Screen of Death (BSOD) error commonly experienced by Windows users who have Nvidia graphics cards. It indicates an issue with the Nvidia Windows Kernel Mode Driver.

Why does the Nvlddmkm.sys error occur?

This error can occur due to various reasons, including outdated or incompatible graphics drivers, conflicts between voltage and memory timing, overheating of the GPU, issues with RAM, or GPU overload.

How can I fix the Nvlddmkm.sys error?

Common methods to fix this error include updating graphics drivers, uninstalling corrupted drivers, repairing damaged system files using tools like CHKDSK, SFC, or DISM, underclocking the GPU to reduce temperature and voltage, and performing a system restore.

Is it safe to underclock my GPU to fix the Nvlddmkm.sys error?

Yes, underclocking your GPU is generally safe and can be effective in reducing the temperature and voltage, which may solve the Nvlddmkm.sys error. However, it's important to do it cautiously and monitor the GPU's performance.

What should I do if none of the methods fix the Nvlddmkm.sys error?

If you've tried all the methods and the error persists, it could be indicative of a deeper hardware issue. In such cases, consulting with a professional technician or contacting Nvidia support for further assistance is recommended.
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