How to disable driver signing (integrity checks) in Vista 64 / Server 2008 x64 ?
Microsoft has introduced a new kernel security component for the 64-bit editions of Vista. Windows mandatory kernel mode and driver signing implies that all modules or drivers designed to run at kernel level have to feature digital signatures, to attest the software is provided by a legitimate publisher. Still, not all drivers are signed and there are many legitimate reasons for disabling driver signing in Vista.
To work around this issue and disable driver signing integrity checks in Windows Vista 64, run the following in Command Prompt:
bcdedit /set loadoptions DISABLE_INTEGRITY_CHECKS
Alternatively, you can try the following to turn on test signing:
bcedit /set testsigning ON
Note: If your version does not support the above commands (due to security updates or Service Packs), the alternative is to press F8 at system startup to bypass driver signing integrity check. Unfortunately this is valid only for the current session.
Another method involves creating your own certificates, and test signed drivers... To do that, you need to download and use the Windows Driver Kit (Windows Driver Kit). Actually, all you need from the above 2Gb ISO is the 4 small files in C:\WinDDK\6000\bin\SelfSign. For more detailed instructions on self-signing your drivers, check this thread over at Rage3d: http://www.rage3d.com/board/showthread.php?t=33920573
The last method involves downloading/installing a small program called ReadyDriver Plus that allows for using unsigned drivers with Vista x64. The latest version (1.1) is downloadable directly from -here-.