Szia!

Most csak angolul írom le, egy fórumról kimásolva:

"Test Mode: Disable driver signature enforcement

You could try this method if you don’t want Windows to always run in Test Mode. Compared to always running Windows in Test Mode, “Disable driver signature enforcement” method needs to be applied each time you install a new driver that is unsigned and might be problematic on Windows 7.
How to disable driver signature enforcement
Simple way (in some cases it might not work or require some additional steps in Windows 8/8.1/10):
Restart PC
Press F8 repeatedly just after UEFI/BIOS intialization and just before Windows would load
Select “Disable driver signature enforcement” option.
Install drivers. After you restart your system again you won’t be able to install unsigned drivers until you repeat the steps 1-3.
or
Alternative way for Windows 8.1 ( and possibly Windows 10):
In Windows go to PC settings (you can search for it in Start).
Click on “Update & recovery” on the left side.
Click on “Recovery” on the left side.
Click “Restart Now” button under Advanced startup.
Select Troubleshoot ->Advanced setup -> Startup Settings and press Restart
Press 7 number key corresponding to “Disable driver signature enforcement” entry.
Install drivers. After you restart your system again you won’t be able to install unsigned drivers until you repeat the steps 1-6."

Ui:

Windows 10-zen még nem kellett használnom, Windows 8-on viszont igen!

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