nvlddmkm.sys STOP: 0x00000050 BSOD

nvlddmkm.sys STOP: 0x00000050 BSOD following me to the darkest ends of the earth, I need help!

My problem seems to be quite unsolvable, and no one seems to be able to give me a strait answer.  Hopefully someone here has had the same problem I've been struggling for months with.

My home built computer has been problem free for a couple of years until now. I have an nvidia 9400GT video card and nForce 940 SLI chipset with 4GB SLI ready RAM, and an AMD 64 Athlon X2 6000+ CPU.

It started with windows XP, the infamous blue screen of death pointing to various nvidia drivers each time.  A few months ago I upgraded to windows 7 64 bit, and a new hard drive.  Upon installation, windows installed the drivers for my nvidia 9400GT video card by itself.  A few months later I randomly got my first windows 7 blue screen error saying, STOP: 0x00000050 page fault in nonpaged area, and pointing to a file called nvlddmkm.sys.  The same type of blue screen I was getting with windows xp. This led me to believe I had a memory leak.  I ran tests, I FOUND NOTHING wrong with the memory!! AAHHH!!!  These crashes seem random, and only happen maybe twice a month or less.

I have done weeks of research and tried almost everything suggested for this problem, I've tried:

-diskcheck on all drives.

-windows memory diagnostic 2 times, along with memtest86 with no problems listed.

- uninstalled all anti virus and gone with microsoft security essentials.

-updated video drivers.

-and I have stopped all start-up programs and disabled all non-Microsoft services.

-I also disabled any bios caching-shadowing.

-all fans are functioning, nothing is overheating.

The file responsible according to the blue screen was nvlddmkm.sys, an nvidia windows kernel mode driver version 196.21.


If anyone can help I would really appreciate it.  I'm almost to the point of junking my home made computer.


Question Info

Last updated June 10, 2019 Views 7,555 Applies to:

You can read and post the minidumps with the BlueScreenView utility (free) which is easy to use.
It also avoids you having to upload them and saves time since all that see the thread can read the

Have you added any hardware lately? Have you updated any driver just before these started? (Check
Control Panel - Windows Updates to see if any drivers were updated there about the time this started)
Main likely culprits are Video driver, other major drivers, memory, and antivirus/antispyware/security
products could be at fault as well as drive issues.

Would be a good idea to remove all power and remove and reseat all cards, memory, and cables (on
both ends) - do not just snug - actually remove and reseat. Of course if a laptop all you can do is
reseat the memory.

Use the troubleshooter below and refer to the next message for drivers and memory when you get to
those sections and then return back to the troubleshooter as needed.


BCCode: 50     0x00000050


The BCCode 50 usually occurs after the installation of faulty hardware or in the event of failure of
installed hardware (usually related to defective RAM, be it main memory, L2 RAM cache, or video

Another common cause is the installation of a faulty system service.

Antivirus software can also trigger this error, as can a corrupted NTFS volume.

Resolving the Problem

Resolving a faulty hardware problem: If hardware has been added to the system recently, remove
it to see if the error recurs. If existing hardware has failed, remove or replace the faulty component.
You should run hardware diagnostics supplied by the system manufacturer. For details on these
procedures, see the owner's manual for your computer.

Resolving a faulty system service problem: Disable the service and confirm that this resolves the
error. If so, contact the manufacturer of the system service about a possible update. If the error
occurs during system startup, restart your computer, and press F8 at the character-mode menu
that displays the operating system choices. At the resulting Windows Advanced Options menu,
choose the Last Known Good Configuration option. This option is most effective when only
one driver or service is added at a time.

Resolving an antivirus software problem:
Disable the program and confirm that this resolves the
error. If it does, contact the manufacturer of the program about a possible update.

Resolving a corrupted NTFS volume problem: Run Chkdsk /f /r to detect and repair disk errors.
You must restart the system before the disk scan begins on a system partition. If the hard disk is
SCSI, check for problems between the SCSI controller and the disk.

Finally, check the System Log in Event Viewer for additional error messages that might help
pinpoint the device or driver that is causing the error. Disabling memory caching of the BIOS
might also resolve it.

BCCode: 50     0x00000050  <-- read this


Look in the Event Viewer to see if anything is reported about those.

MyEventViewer - Free - a simple alternative to the standard event viewer of Windows.
TIP - Options - Advanced Filter allows you to see a time frame instead of the whole file.


Also do this so you can see the likely bluescreens.

Windows Vista automatically restarts if your PC encounters an error that causes it to crash.


Here are some methods to possibly fix the blue screen issue. If you could give the Blue Screen
info that would help. Such as the BCC and the other 4 entries on the lower left. And any other
error information such as STOP codes and info such as IRQL_NOT_LESS_OR_EQUAL or PAGE_FAULT_IN_NONPAGED_AREA and similar messages.

As examples :

BCCode: 116
BCP1: 87BC9510
BCP2: 8C013D80
BCP3: 00000000
BCP4: 00000002

or in this format :

Stop: 0x00000000 (oxoooooooo oxoooooooo oxooooooooo oxoooooooo)
tcpip.sys - Address 0x00000000 base at 0x000000000 DateStamp 0x000000000

This is an excellent tool for posting Blue Screen Error Information

BlueScreenView scans all your minidump files created during 'blue screen of death'
crashes, and displays the information about all crashes in one table - Free


Many BlueScreens are caused by old or corrupted drivers, especially video drivers however
there are other causes.

You can do these in Safe Mode if needed or from Command Prompt from Vista DVD or
Recovery Options if your system has that installed by the maker.

How to Boot to the System Recovery Options in Windows 7

You can try a System Restore back to a point before the problem started if there is one.

How to Do a System Restore in Windows 7


Start - type this in Search Box ->  COMMAND   find at top and RIGHT CLICK  -  RUN AS ADMIN

Enter this at the prompt - sfc /scannow

How to Repair Windows 7 System Files with System File Checker

How to analyze the log file entries that the Microsoft Windows Resource Checker (SFC.exe) program
generates in Windows Vista cbs.log (and Windows 7)

The log might give you the answer if there was a corrupted driver. (Does not tell all the possible
driver issues).

Also run CheckDisk so we can rule out corruption as much as possible.

How to Run Check Disk at Startup in Windows 7


Often updating drivers will help, usually Video, Sound, Network Card  (NIC), WiFi, 3rd party
keyboard and mouse, as well as other major device drivers.

Manually look at manufacturer's sites for drivers - and Device Maker's sites.

Installing and updating drivers in 7

How To Disable Automatic Driver Installation In Windows Vista - Drivers


How to fix BlueScreen (STOP) errors that cause Windows Vista to shut down or restart

Troubleshooting Vista Blue Screen, STOP Errors (and Windows 7)

Understanding and Decoding BSOD (blue screen of death) Messages

Windows - Troubleshooting Blue Screen Errors


In some cases this might be required.

StartUp Repair from Recovery Options or Windows 7 disk

How to Run a Startup Repair in Windows 7

How to Boot to the System Recovery Options in Windows 7

How to Create a Windows 7 System Repair Disc

Hope this helps.

Rob Brown - MS MVP - Windows Desktop Experience : Bicycle - Mark Twain said it right.
Rob Brown - Microsoft MVP - Windows and Devices for IT 2010 - current
Windows Insider MVP 2016 - current

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