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Windows requires a digitally signed driver

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Hello everyone,


I have been using Smart Defrag on all my devices for about two years now. Recently I built a new computer and I've only now thought getting Smart Defrag again. This time, after I install the Program, I recieve an error message which states "Windows requires a digitally signed driver". I do not know what causes this, if it changes anything or how to remove it.

I use Windows 10 Home 64bit and this is the first time I have ever encountered this problem.



This is the error I get. I got this picture from another website, since I could not use my original error message because it is in German.


Thank you in advance!

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Hello Biins


Welcome to our forum.


Please download and install the latest Smart Defrag v5.5 from the link below to see if still any issue:




If the problem is still there, please let me know and help us to look into the issue.


To look into the issue, please download the tool from: http://testdemo.iobit.com/SD5InfoHelper.exe


Then double click to run this tool and click “Save report to Desktop”. You will get a zipped file IObit_Debug_Info.zip on your desktop. Please send it to us so that we can get the detailed information to look into.




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  • 3 weeks later...

I hope that upgrading to latest version solved your problem with unsigned driver, but if not you can always install unsigned drivers, but only if you are 100% sure that driver file is not corrupted!!


You can find solid walk-through on this link https://en.code-bude.net/2015/08/19/how-to-install-unsigned-drivers-in-windows-10/


Hope that you find this helpful.



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