Иване, пробвай така:
Disable Driver Signature Enforcement Permanently and Completely
You can try commands to disable driver signature enforcement permanently and completely.
Step 1. Open a Command Prompt with admin privileges. In Windows 10/8.1/8, press the Windows key + X and select “Command Prompt (admin)”. In Windows 7/XP/Vista, you can type “command prompt” in the Start search box, right-click on “Command Prompt” in the result and select “run as administrator”.
command prompt admin
Step 2. Type the following command and press the Enter key:
bcdedit /set testsigning on
You should receive the “The operation completed successfully” message.
command prompt type command
In our test, you can also type the commands as below:
Please press after each line.
bcdedit.exe -set loadoptions DDISABLE_INTEGRITY_CHECKS
bcdedit.exe -set TESTSIGNING ON
Step 3. Close the Command Prompt window and restart your computer. Now you can install any unsigned drivers without problems.
Взето е от тук. Има и картинки. Гледай вариант 2:
http://www.drivethelife.com/windows-driv...vista.html