Here another trick, tested on Vista, Win7 & Win 8.1
Code:
Enable the testsigning mode in the vista/7/8/8.1 boot loader:
bcdedit.exe /set TESTSIGNING ON
These instructions are for the first time you sign a driver:
1) Create the certificate:
makecert.exe -$ individual -r -pe -ss "WRFan Certificate Store" -n CN="WRFan Treibersignierung" "WRFan Treibersignierung.cer"
2) Install the certificate into the Trusted Root Certification Authorities store:
certmgr.exe /add "WRFan Treibersignierung.cer" /s /r localMachine root
or do it manually through the Certificate snap-in:
%windir%\System32\certmgr.msc
3) Sign the driver with the certificate:
signtool.exe sign /v /s "WRFan Certificate Store" /n "WRFan Treibersignierung" BT848.sys
4) Verify the signed driver validity:
signtool.exe verify /pa /v BT848.sys
5) Overwrite the original driver with the signed one and reboot your system. Changes to the vista boot loader require a reboot,
if you already are in testsigning mode, you might open the device manager and re-activate the device that relies
on the signed driver, then a reboot is not necessary
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For signing further drivers, repeat steps 3 + 4 + 5
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