Windows 10: BSOD often; "kernel security check failure"

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  1.    14 Aug 2015 #1

    BSOD often; "kernel security check failure"

    I built this computer a year or so ago and upgraded to Windows 10 only recently. I have had no problems at all until yesterday. BSOD now happens quite often. In fact, I'm expecting it to happen any minute now.

    I have tried googling the problem and used BlueScreenView to look at the .dmp file. It points to ntoskrnl.exe. From what I could find on Google, that means it's most likely a memory problem. I ran the windows memory test and it found no errors. I turned on the Windows verifier program, which also caused a BSOD. Upon resetting, another BSOD appeared but this time it listed this file as the problem: "nvlddmkm.sys". I tried uninstalling and reinstalling my NVIDIA driver, but the BSOD has not gone away.

    Any help would be greatly appreciated. Thanks!

    Attachment 31413
      My ComputerSystem Spec

  2. essenbe's Avatar
    Posts : 11,342
    Windows 10 Pro and Windows 10 Pro Insider
       15 Aug 2015 #2

    dizzam, Hello and welcome to the forums. I would like you to do something for me,

    Please go to your last post and in the bottom left corner click 'My System Specs'. there is a link there to update your system specs, click it and fill them all out in as much detail as possible. Please list Manufacturer and Model, and list Desktop or Laptop. If it is an OEM, please list the Manufacturer and Model number. Please be sure to list your PSU and CPU cooler. If you would like to know what we would like, please click 'My System Specs' at the bottom left of this post and see mine.

    I have looked at your last few dump files and they all are pretty consistent.

    Use !analyze -v to get detailed debugging information.
    BugCheck 139, {8, ffffd00021dd4830, ffffd00021dd4788, 0}
    *** WARNING: Unable to verify timestamp for rtwlanu.sys
    *** ERROR: Module load completed but symbols could not be loaded for rtwlanu.sys
    Probably caused by : rtwlanu.sys ( rtwlanu+21fe9d )
    Followup: MachineOwner
    That is your Realtek RTLxxxxx Wireless USB 2.0 Adapter .

    Try and see what happens and use a wired connection to whatever that goes to. Just remove the USB Adapter. See if you have better luck.

    Next please right click on the start icon and select Command prompt administrator, give admin permissions and copy/paste this into the window that opens and press enter sfc /scannow . If you decide to type it in, please notice the space between the sfc and the /. We want it to say no integrity violations were found. If it says there where corrupt files that could not be repaired, please reboot and run it again. You may have to run it 3 times with reboots in between each time.
      My ComputersSystem Spec

  3.    16 Aug 2015 #3

    Thanks essenbe for the response. I updated my system specs. Before I heard from you I continued to Google the problem and try some troubleshooting. I ran Memtest86 overnight and came up with 192 errors over 5 passes, all on Test 13. I also did a clean install of Windows 10, which fixed the problem for a while, but now it's back. I have attached post-clean install dump files, in case that's helpful.

    The driver you referenced goes to my USB wireless internet adapter. I need to buy a cable, but don't have one right now so I can't post online and disable the driver.

    I am working on the command prompt instructions you gave and will update when I finish. Thanks again for your help.

    Attachment 31697

    Edit: Just finished running the sfc /scannow and got this result first try: "Windows Resource Protection did not find any integrity violations."

    Also, I noticed that the BSOD happens most often when using my web browser. I was just playing Heroes of the Storm online for quite some time and only experienced 1 BSOD. Using the browser, seems to happen much more frequently.
      My ComputerSystem Spec

  4. essenbe's Avatar
    Posts : 11,342
    Windows 10 Pro and Windows 10 Pro Insider
       16 Aug 2015 #4

    If you ran Memtest and found 192 Errors, you found your problem most likely. Now, run 1 stick at a time in each slot. Keep track of which stick and the results in each slot. A bad stick of ram should show errors in each slot and a good stick of ram should pass in each slot. That is to determine if you have bad ram or bad Dimm Slots on your Motherboard. You are fortunate in that Crucial has a lifetime warranty on their Ram. RMA Both sticks so you can get a kit in return. When testing please use the test found on this page
      My ComputersSystem Spec

  5.    16 Aug 2015 #5

    I downloaded Memtest from the site you linked. Last time I got a different version from another site and the program looked different.

    The program ran through all the tests once and is over half way through a second time with 0 errors. How many passes should I let it run before I can safely say it's not the RAM?
      My ComputerSystem Spec

  6. essenbe's Avatar
    Posts : 11,342
    Windows 10 Pro and Windows 10 Pro Insider
       16 Aug 2015 #6

    A minimum of 8. These are the instructions I usually give.

    Please Run Memtest86+

    information   Information
    Please download from this site only in the middle of the page are the Download links, you can download the or the Auto USB Flash Drive
    Extract the Zip file. If you chose the ISO image, burn it to a CD using Windows Disk Image Burner or any Image burner you may have. If you downloaded the Auto USB installer, extract it, insert your USB 2.0 Flash Drive and take note of the drive letter. Run the installer, select the Flash Drive Letter, check the format box and press next. It will install memtest86+ to a flash drive. You can use either V4.20 or V5.01. Boot from your selected media. If you use V5.01 it will tell you to press certain buttons at the start, please press no buttons. The test will begin on it's own and continue to run until you stop it. It needs to run for 8 complete passes or until you receive an error. If you receive an error, stop the test. Even 1 error is a fail. Each pass tests a different part of the ram and each of the 10 tests in each pass tests something different. It takes a minimum of 8 passes to completely test the ram, more passes are better. It is quite a long test and will take several hours depending on how much ram you have. Due to the time length it is best to run overnight. If you have any questions, please do not hesitate to ask
      My ComputersSystem Spec

  7.    16 Aug 2015 #7

    Just finished 8 passes. Still 0 errors.
      My ComputerSystem Spec

  8. essenbe's Avatar
    Posts : 11,342
    Windows 10 Pro and Windows 10 Pro Insider
       16 Aug 2015 #8

    OK, we'll try something else. just no program is 100% accurate every time. Can you get a cable pretty soon? Due to the fact that the dump named your USB Wireless, I would like to take that out of the equation to see if that is, in fact, the cause.
      My ComputersSystem Spec

  9.    18 Aug 2015 #9

    Just got the cord tonight. I have no idea if it fixed the problem, but wow it's a lot faster. Went from 30-40 mbps to 170 mbps. Is it best to just use the computer as much as possible and see if the BSOD appears?
      My ComputerSystem Spec

  10. essenbe's Avatar
    Posts : 11,342
    Windows 10 Pro and Windows 10 Pro Insider
       18 Aug 2015 #10

    By all means. Use it as much as you want to. That's how we'll know if it is fixed ot not.
      My ComputersSystem Spec

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