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Konstantinos Tsoukalas

Konstantinos is the founder and administrator of Since 1995 he works and provides IT support as a computer and network expert to individuals and large companies. He is specialized in solving problems related to Windows or other Microsoft products (Windows Server, Office, Microsoft 365, etc.).


  1. saini
    October 19, 2023 @ 6:14 pm

    Well done! Your article provided great tips and advice.


  2. abhay
    August 13, 2023 @ 10:27 am

    Doesnt help me with Ralink Bluetooth Pcie Adaptor when I updated a HP Pavilion 23 AIO windows 8.1 to windows 10.
    Attempted all methods upto ' bcdedit /set nointegritychecks ON', but still the yellow exclamation mark refuses to go with code 39 error.


  3. Nick86
    July 21, 2023 @ 5:17 pm

    Regarding last nvidia 474.44 drivers, to avoid installing telemetry and other bloatware, unzip the 474.44-desktop-win7-64bit-international.exe file, delete all the folders but the ones listed below:


    Open setup.cfg with notepad and remove these 3 lines near the bottom:

    Now you can have a clean installation of the latest win 7 nvidia drivers without thetelemtry and other useless crap.


  4. David Kermott
    July 13, 2022 @ 3:42 pm

    Win7SP1 does not have SHA-2 support. There are 2 KB hot-fixes that may need to be installed. The drivers you are attempting to install may be digitally signed but Win7SP1 cannot determine it.
    Install KB4474419 and KB4490628 (in that order) and then try to install the drivers.


    • Nick86
      July 21, 2023 @ 5:08 pm

      Hello, i have these two KB installed, was able to install last 474.44 nvidia drivers for Win 7 BUT after the reboot the device got disabled with a yellow mark, again the signature error.

      To solve this issue one time for all the only way is to use the "bcdedit /set testsigning on" and disable the signature check.

      Side note:
      Do not use the "bcdedit /set nointegritychecks ON", an annoying signature warning message appear on the bottom right of the screen, the first command line is enought.


  5. Muhammad Asim
    July 16, 2019 @ 11:31 am

    windows 10 ,8 & 8.1 first option done. I appreciate you. Bundle of Thanks.


  6. david
    June 4, 2019 @ 7:03 pm

    Very thanks!! it works!!


  7. Steve L
    August 7, 2018 @ 12:08 am

    i am reserrecting an old dell Inspiron 600, with Win7 Home Premium, with a Atheros 1506 internet adapter(IA). when i updated BIOS, drivers and OS, I lost the IA because of digital signature issue (Code 52). Your step by step solution ended a week of loading/unloading, enable/disable h/w as well as drivers as directed by dell support assistant, and some 'experts' in MicroSoft. now, it is millertime, thanx


  8. KC8DKT
    February 17, 2018 @ 2:44 pm

    This is a 1 time PERM way to turn it off!

    "bcdedit.exe -set loadoptions DDISABLE_INTEGRITY_CHECKS"


  9. GM
    January 28, 2018 @ 1:11 am

    My solution, if got w7, upgrad w10, free, then crash, check this, devicemanager, show hiidden drivers, go to jraid ,sys, set automatic, (worked for me) or deactivated, No more probs.
    To mount a black/blue screen, hold f4, then go to f8, hold, then choose shut of driver forced …ok?


  10. Saape
    November 3, 2017 @ 7:17 pm

    Thank You!


  11. Ron Jackson
    June 7, 2017 @ 4:59 pm

    Does anyone know how to get into the F8 or F7 menus on a Surface Book if the keyboard isn't responding?

    Or how to ensure the Surface Book boots from bootable USB? I changed the boot order in the UEFI, but it still won't boot from USB


  12. Jacob winckowski
    February 26, 2017 @ 12:07 am

    When performing solution 1, I get to step 7, but every time I press 7 or F7, it just automatically restarts my computer and wont proceed to step 8? I have followed your steps and multiple times, and it occurs every time.


    • lakonst
      February 26, 2017 @ 12:54 pm

      @Jacob winckowski: After pressing the “F7” (or the “7”) key, your system should reboot (it is normal). When Windows starts, proceed to step 8 and install the unsigned driver.


  13. bcvfg
    February 4, 2017 @ 3:48 pm

    it does not work
    only the temporary solution works


  14. helpmeSAVEME
    January 31, 2017 @ 4:31 pm

    HELP I have a PROBLEm VOxALDRIVER64.SYS IS SCREWIN MY Speakers There is no sound
    when i go into device manager it has a yellow ! triangle warrning simbol can you help me fix this OS:WINDOWS 7 XP ULTIMATE i installed voxal sound changer i think i got it from that it says that it isnt verified it was verified before but the voxal sound changet added anotha file thingy and that file thingy isnt verified and now i cant have sound any sound even with headphones


    • lakonst
      January 31, 2017 @ 5:56 pm

      @helpmeSAVEME: Uninstall the 'Voxal Voice Changer' program and then restore your computer to a previous working state.


  15. m.aqil
    November 6, 2016 @ 1:19 pm

    i HAd problem with test mode windows 8 build 9200 and i searched how to remove it with a method in cmd i dont remember how it was and after i did it i restarted my laptop it went to automatic repair and atpemting repair and it took like 30 min and i pressed the f7 key which was disable signature or smthing then i was able to log in to my laptop and i tried method 2 and wORKEDD THANKKKKKSSS!!!


  16. Actionaunty
    September 5, 2016 @ 9:50 pm

    I have been trying to install W7pro on to a laptop with 8.1 which automatically upgraded to W10. It seems that W10 will not be overwritten.
    Neither your solution 1 or 2 worked and this is the message I get:
    C:\WINDOWS\system32>bcdedit /set testsigning on
    An error has occurred setting the element data.
    The value is protected by Secure Boot policy and cannot be modified or deleted.

    Your advice would be greatly appreciated.


    • lakonst
      September 6, 2016 @ 9:29 am

      @Actionaunty: A. Disable the Secure Boot option in BIOS settings. (This option is usually in either the Security tab, the Boot tab, or the Authentication tab).
      B. From Windows: 1. Hold down the Shift key and click Restart. 2. After PC restarts go to: Troubleshoot > Advanced Options: UEFI Firmware Settings and find the Secure Boot setting and set it to Disabled.
      After disabling the secure boot try install the unsigned driver or delete all disk partitions and perform a clean Windows installation.
      Good luck!


  17. Octav
    August 11, 2016 @ 5:16 pm

    I think the correct comand to DISABLE completly driver signature (metod 2) is:

    bcdedit /set testsigning OFF

    And, of course, in Windows 7 be sure to run the CMD promt as an administrator…


  18. Judy M.
    August 10, 2016 @ 9:11 am

    I'm sorry but I tried both solutions and does not work. I had an HP notebook with Win pro 7. Having Motherboard problems. Went out bought Lenova ideapad 300 with Win 10. I want win pro 7. I successfully partitioned the C drive. Went to install win pro 10 from disc. Goes thru 1 & 2 and then goes to restart and get error message about the signature verification. Have tried mat least 6 times now and same error. I tried the method for win 7 and for win 10 and same results. What else can be done?


    • lakonst
      August 17, 2016 @ 2:20 pm

      @Judy M: 1. Create first the LENOVO recovery disks (for backup reasons) and then 2. Boot from the Win7 install disk and start the Windows installation. 3.Delete all the partitions on the disk. 4. Select the "Unpartitioned" space to install Windows. 3. When asked DO NOT enter a serial number and finish the installation.
      From Windows: After installing all the drivers needed for your system, try to "Activate Windows" automatically (enter the Serial number and activate) and if you have problems with automatic activation: Click Start and in the Search box, type: "slui.exe 4" (without quotes). Select your country and click the "Phone Activation" option and activate Windows by phone.


  19. Abhishek
    July 4, 2016 @ 10:19 am

    Unable to load the Os and digital signature status shows : 0xc0000428


    • lakonst
      August 17, 2016 @ 1:52 pm

      @Abhishek: Press F8 to enter to Advanced options menu and select to boot to "Last Known Good Configuration" or Select "Disable driver signature" and then from Windows disable the driver signature completely (Solution 2 on this post).


  20. CeuxDruman
    June 24, 2015 @ 4:41 pm

    Sorry, but when I press Restart in the Startup Settings it say that I need to enter a Recovery Key or something like that… (Im using a Surface RT).

    ¿What is that and what can I do?


    • lakonst
      June 24, 2015 @ 5:31 pm

      @CeuxDruman: I don't understand what you mean. But, if you have problems with solution-1 try solution-2.


  21. Chris
    February 24, 2015 @ 6:20 am

    windows does not have enough information to verify this certificate

    What about this problem on installed drivers?


    • lakonst
      February 24, 2015 @ 11:37 am

      Ignore this error and just install AMD drivers. I think it is not an important error!


  22. camstuf
    February 22, 2015 @ 10:42 pm

    Solution 2 for Windows 7 in Safe mode command prompt says successful, but still get warnings


  23. help
    February 18, 2015 @ 7:15 am

    I'm not good at computers and these software stuff but I happen to encounter this "cannot verify" notification when I tried to download a software so I searched google and it lead me here.

    I tried to do the 'Solution 1' to minimize potential risks but I have a problem when I typed the "shutdown /r /o" because nothing happens. I'm wondering if I typed the wrong command or there's just something wrong. I use Windows 7


  24. XP LOVER
    January 27, 2015 @ 9:47 am

    Thank you very much for this complete and detailed tutorial. This will help a lot of people in the future.
    As years go by i like more and more Win XP.


  25. Soft32
    December 11, 2014 @ 10:02 pm

    Hello, I miss more than 1 hour for this problem…I FIXED only then CHANGED in The BIOS settings in "Security" section "save boot" from enabled To DISABLED. (I recommend in bios to look in the right screen for more details and cereafull read something like "Signature", "Software security boot". by this time I use Toshiba, but I hope should work with others laptops too) good luck.


  26. Digital Signature
    July 22, 2014 @ 7:26 am

    This is a very nice article and gives in-depth information. Thanks for this nice article, which is a really good to read. I must admit that you are one of the best bloggers I ever saw. Thanks for posting this informative article, which is an excellent example of Windows cannot verify the digital signature for this file. I really appreciate it and I think people will like you.


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